Stop making ~/music when mpd starts.
[termux-packages] / build-package.sh
index 1eda2ee..621ac02 100755 (executable)
 
 set -e -o pipefail -u
 
-# Read settings from .termuxrc if existing:
-test -f $HOME/.termuxrc && . $HOME/.termuxrc
-
-# Handle command-line arguments:
-show_usage () {
-    echo "Usage: ./build-package.sh [-a ARCH] [-d] [-D] PACKAGE"
-    echo "Build a package by creating a .deb file in the debs/ folder."
-    echo "  -a The architecture to build for: aarch64(default), arm, i686, x86_64 or all."
-    echo "  -d Build with debug symbols."
-    echo "  -D Build a disabled package in disabled-packages/."
-    echo "  -s Skip dependency check."
-    exit 1
-}
-while getopts :a:hdDs option
-do
-    case "$option" in
-        a) TERMUX_ARCH="$OPTARG";;
-        h) show_usage;;
-        d) TERMUX_DEBUG=true;;
-        D) TERMUX_IS_DISABLED=true;;
-        s) export TERMUX_SKIP_DEPCHECK=true;;
-        ?) echo "./build-package.sh: illegal option -$OPTARG"; exit 1;;
-    esac
-done
-shift $(($OPTIND-1))
-if [ "$#" -ne 1 ]; then show_usage; fi
-
-# Configurable settings:
-: ${ANDROID_HOME:="${HOME}/lib/android-sdk"}
-: ${NDK:="${HOME}/lib/android-ndk"}
-: ${TERMUX_MAKE_PROCESSES:='4'}
-: ${TERMUX_TOPDIR:="$HOME/.termux-build"}
-: ${TERMUX_ARCH:="aarch64"} # arm, aarch64, i686 or x86_64.
-if [ "x86_64" = $TERMUX_ARCH -o "aarch64" = $TERMUX_ARCH ]; then
-       TERMUX_ARCH_BITS=64
-else
-       TERMUX_ARCH_BITS=32
-fi
-TERMUX_HOST_PLATFORM="${TERMUX_ARCH}-linux-android"
-if [ $TERMUX_ARCH = "arm" ]; then TERMUX_HOST_PLATFORM="${TERMUX_HOST_PLATFORM}eabi"; fi
-: ${TERMUX_PREFIX:='/data/data/com.termux/files/usr'}
-: ${TERMUX_ANDROID_HOME:='/data/data/com.termux/files/home'}
-: ${TERMUX_DEBUG:=""}
-: ${TERMUX_PROCESS_DEB:=""}
-: ${TERMUX_API_LEVEL:="21"}
-: ${TERMUX_ANDROID_BUILD_TOOLS_VERSION:="24.0.1"}
-: ${TERMUX_NDK_VERSION:="13"}
-: ${TERMUX_IS_DISABLED:=""}
-
-# Check the NDK:
-if [ ! -d "$NDK" ]; then
-       echo 'ERROR: $NDK not defined as pointing at a directory - define it pointing at a android NDK installation!'
-       exit 1
-fi
-if grep -s -q "Pkg.Revision = $TERMUX_NDK_VERSION" $NDK/source.properties; then
-       :
-else
-       echo "Wrong NDK version - we need $TERMUX_NDK_VERSION"
+# Utility function to log an error message and exit with an error code.
+termux_error_exit() {
+       echo "ERROR: $*" 1>&2
        exit 1
-fi
-
-# Check the package to build:
-TERMUX_PKG_NAME=`basename $1`
-export TERMUX_SCRIPTDIR=`cd $(dirname $0); pwd`
-if [[ $1 == *"/"* ]]; then
-  # Path to directory which may be outside this repo:
-  if [ ! -d $1 ]; then echo "ERROR: '$1' seems to be a path but is not a directory"; exit 1; fi
-  export TERMUX_PKG_BUILDER_DIR=`realpath $1`
-else
-  # Package name:
-  if [ -n "$TERMUX_IS_DISABLED" ]; then
-    export TERMUX_PKG_BUILDER_DIR=$TERMUX_SCRIPTDIR/disabled-packages/$TERMUX_PKG_NAME
-  else
-    export TERMUX_PKG_BUILDER_DIR=$TERMUX_SCRIPTDIR/packages/$TERMUX_PKG_NAME
-  fi
-fi
-TERMUX_PKG_BUILDER_SCRIPT=$TERMUX_PKG_BUILDER_DIR/build.sh
-if test ! -f $TERMUX_PKG_BUILDER_SCRIPT; then
-       echo "ERROR: No build.sh script at supposed package dir $TERMUX_PKG_BUILDER_DIR!"
-       exit 1
-fi
-
-# Handle 'all' arch:
-if [ $TERMUX_ARCH = 'all' ]; then
-       for arch in 'arm' 'i686' 'aarch64' 'x86_64'; do
-               ./build-package.sh -a $arch $1
-       done
-       exit
-fi
-
-# We do not put all of build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/ into PATH
-# to avoid stuff like arm-linux-androideabi-ld there to conflict with ones from
-# the standalone toolchain.
-TERMUX_DX=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/dx
-TERMUX_JACK=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jack.jar
-TERMUX_JILL=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jill.jar
-# Make $TERMUX_TAR and $TERMUX_TOUCH point at gnu versions:
-export TERMUX_TAR="tar"
-test `uname` = "Darwin" && TERMUX_TAR=gtar
-export TERMUX_TOUCH="touch"
-test `uname` = "Darwin" && TERMUX_TOUCH=gtouch
-
-export prefix=${TERMUX_PREFIX} # prefix is used by some makefiles
-export PREFIX=${TERMUX_PREFIX} # PREFIX is used by some makefiles
-export TERMUX_COMMON_CACHEDIR="$TERMUX_TOPDIR/_cache"
-export TERMUX_DEBDIR="$TERMUX_SCRIPTDIR/debs"
-export PKG_CONFIG_LIBDIR=$TERMUX_PREFIX/lib/pkgconfig
-mkdir -p $TERMUX_COMMON_CACHEDIR $TERMUX_DEBDIR
-
-TERMUX_PKG_BUILDDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/build
-TERMUX_PKG_CACHEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/cache
-TERMUX_PKG_MASSAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/massage
-TERMUX_PKG_PACKAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/package
-TERMUX_PKG_SRCDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/src
-TERMUX_PKG_SHA256=""
-TERMUX_PKG_TMPDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/tmp
-TERMUX_PKG_HOSTBUILD_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/host-build
-TERMUX_PKG_PLATFORM_INDEPENDENT=""
-TERMUX_PKG_NO_DEVELSPLIT=""
-TERMUX_PKG_BUILD_REVISION="0" # http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Version
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS=""
-TERMUX_PKG_EXTRA_HOSTBUILD_CONFIGURE_ARGS=""
-TERMUX_PKG_EXTRA_MAKE_ARGS=""
-TERMUX_PKG_BUILD_IN_SRC=""
-TERMUX_PKG_RM_AFTER_INSTALL=""
-TERMUX_PKG_DEPENDS=""
-TERMUX_PKG_HOMEPAGE=""
-TERMUX_PKG_DESCRIPTION="FIXME:Add description"
-TERMUX_PKG_FOLDERNAME=""
-TERMUX_PKG_KEEP_STATIC_LIBRARIES="false"
-TERMUX_PKG_ESSENTIAL=""
-TERMUX_PKG_CONFLICTS="" # https://www.debian.org/doc/debian-policy/ch-relationships.html#s-conflicts
-TERMUX_PKG_REPLACES=""
-TERMUX_PKG_CONFFILES=""
-TERMUX_PKG_INCLUDE_IN_DEVPACKAGE=""
-TERMUX_PKG_DEVPACKAGE_DEPENDS=""
-# Set if a host build should be done in TERMUX_PKG_HOSTBUILD_DIR:
-TERMUX_PKG_HOSTBUILD=""
-TERMUX_PKG_MAINTAINER="Fredrik Fornwall @fornwall"
-TERMUX_PKG_CLANG=no
-
-# Cleanup old state
-rm -Rf $TERMUX_PKG_BUILDDIR $TERMUX_PKG_PACKAGEDIR $TERMUX_PKG_SRCDIR $TERMUX_PKG_TMPDIR $TERMUX_PKG_MASSAGEDIR
-
-# If $TERMUX_PREFIX already exists, it may have been built for a different arch
-TERMUX_ARCH_FILE=/data/TERMUX_ARCH
-if [ -f "${TERMUX_ARCH_FILE}" ]; then
-        TERMUX_PREVIOUS_ARCH=`cat $TERMUX_ARCH_FILE`
-        if [ $TERMUX_PREVIOUS_ARCH != $TERMUX_ARCH ]; then
-                TERMUX_DATA_BACKUPDIRS=$TERMUX_TOPDIR/_databackups
-                mkdir -p $TERMUX_DATA_BACKUPDIRS
-                TERMUX_DATA_PREVIOUS_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_PREVIOUS_ARCH
-                TERMUX_DATA_CURRENT_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_ARCH
-                # Save current /data (removing old backup if any)
-               if test -e $TERMUX_DATA_PREVIOUS_BACKUPDIR; then
-                       echo "ERROR: Directory already exists"
-                       exit 1
-               fi
-                mv /data/data $TERMUX_DATA_PREVIOUS_BACKUPDIR
-                # Restore new one (if any)
-                if [ -d $TERMUX_DATA_CURRENT_BACKUPDIR ]; then
-                        mv $TERMUX_DATA_CURRENT_BACKUPDIR /data/data
-                fi
-        fi
-fi
-echo $TERMUX_ARCH > $TERMUX_ARCH_FILE
-
-# Ensure folders present (but not $TERMUX_PKG_SRCDIR, it will be created in build)
-mkdir -p $TERMUX_PKG_BUILDDIR $TERMUX_PKG_PACKAGEDIR $TERMUX_PKG_TMPDIR $TERMUX_PKG_CACHEDIR $TERMUX_PKG_MASSAGEDIR $PKG_CONFIG_LIBDIR $TERMUX_PREFIX/{bin,etc,lib,libexec,share,tmp,include}
+}
 
+# Utility function to download a resource, optionally checking against a checksum.
 termux_download() {
-       URL="$1"
-       DESTINATION="$2"
+       local URL="$1"
+       local DESTINATION="$2"
+
+       if [ -f "$DESTINATION" ] && [ $# = 3 ] && [ -n "$3" ]; then
+               # Keep existing file if checksum matches.
+               local EXISTING_CHECKSUM
+               EXISTING_CHECKSUM=$(sha256sum "$DESTINATION" | cut -f 1 -d ' ')
+               if [ "$EXISTING_CHECKSUM" = "$3" ]; then return; fi
+       fi
 
-       TMPFILE=`mktemp $TERMUX_PKG_TMPDIR/download.$TERMUX_PKG_NAME.XXXXXXXXX`
+       local TMPFILE
+       TMPFILE=$(mktemp "$TERMUX_PKG_TMPDIR/download.$TERMUX_PKG_NAME.XXXXXXXXX")
        echo "Downloading ${URL}"
-       TRYMAX=6
+       local TRYMAX=6
        for try in $(seq 1 $TRYMAX); do
                if curl -L --fail --retry 2 -o "$TMPFILE" "$URL"; then
-                       local ACTUAL_CHECKSUM=`sha256sum $TMPFILE | cut -f 1 -d ' '`
-                       if [ $# = 3 ]; then
+                       local ACTUAL_CHECKSUM
+                       ACTUAL_CHECKSUM=$(sha256sum "$TMPFILE" | cut -f 1 -d ' ')
+                       if [ $# = 3 ] && [ -n "$3" ]; then
                                # Optional checksum argument:
                                local EXPECTED=$3
-                               if [ $EXPECTED != $ACTUAL_CHECKSUM ]; then
+                               if [ "$EXPECTED" != "$ACTUAL_CHECKSUM" ]; then
                                        >&2 printf "Wrong checksum for %s:\nExpected: %s\nActual:   %s\n" \
                                                   "$URL" "$EXPECTED" "$ACTUAL_CHECKSUM"
                                        exit 1
@@ -197,89 +43,630 @@ termux_download() {
                        mv "$TMPFILE" "$DESTINATION"
                        return
                else
-                       echo "Download of $1 failed (attempt $try/$TRYMAX)" 1>&2
+                       echo "Download of $URL failed (attempt $try/$TRYMAX)" 1>&2
                        sleep 45
                fi
        done
 
-       echo "Failed to download $1 - exiting" 1>&2
-       exit 1
+       termux_error_exit "Failed to download $URL"
 }
 
-# Have a debian-binary file ready for deb packaging:
-test ! -f $TERMUX_COMMON_CACHEDIR/debian-binary && echo "2.0" > $TERMUX_COMMON_CACHEDIR/debian-binary
-# The host tuple that may be given to --host configure flag, but normally autodetected so not needed explicitly
-TERMUX_HOST_TUPLE=`sh $TERMUX_SCRIPTDIR/scripts/config.guess`
-
-# Make $TERMUX_PREFIX/bin/sh executable on the builder, so that build script can assume that it works
-# on both builder and host later on:
-ln -f -s /bin/sh $TERMUX_PREFIX/bin/sh
-
-TERMUX_ELF_CLEANER=$TERMUX_COMMON_CACHEDIR/termux-elf-cleaner
-TERMUX_ELF_CLEANER_SRC=$TERMUX_SCRIPTDIR/packages/termux-elf-cleaner/termux-elf-cleaner.cpp
-if [ $TERMUX_ELF_CLEANER_SRC -nt $TERMUX_ELF_CLEANER ]; then
-       g++ -std=c++11 -Wall -Wextra -pedantic -Os $TERMUX_ELF_CLEANER_SRC -o $TERMUX_ELF_CLEANER
-fi
-
-# Run just after sourcing $TERMUX_PKG_BUILDER_SCRIPT
-termux_step_extract_package () {
-        if [ -z "${TERMUX_PKG_SRCURL:=""}" ]; then
-                mkdir -p $TERMUX_PKG_SRCDIR
-                return
-        fi
-       cd $TERMUX_PKG_TMPDIR
-       filename=`basename $TERMUX_PKG_SRCURL`
-       file=$TERMUX_PKG_CACHEDIR/$filename
-       test ! -f $file && termux_download $TERMUX_PKG_SRCURL $file $TERMUX_PKG_SHA256
+# Utility function for golang-using packages to setup a go toolchain.
+termux_setup_golang() {
+       export GOOS=android
+       export CGO_ENABLED=1
+       export GO_LDFLAGS="-extldflags=-pie"
+       if [ "$TERMUX_ARCH" = "arm" ]; then
+               export GOARCH=arm
+               export GOARM=7
+       elif [ "$TERMUX_ARCH" = "i686" ]; then
+               export GOARCH=386
+               export GO386=sse2
+       elif [ "$TERMUX_ARCH" = "aarch64" ]; then
+               export GOARCH=arm64
+       elif [ "$TERMUX_ARCH" = "x86_64" ]; then
+               export GOARCH=amd64
+       else
+               termux_error_exit "Unsupported arch: $TERMUX_ARCH"
+       fi
+
+       local TERMUX_GO_VERSION=go1.8.3
+       local TERMUX_GO_PLATFORM=linux-amd64
+
+       local TERMUX_BUILDGO_FOLDER=$TERMUX_COMMON_CACHEDIR/${TERMUX_GO_VERSION}
+       export GOROOT=$TERMUX_BUILDGO_FOLDER
+       export PATH=$GOROOT/bin:$PATH
+
+       if [ -d "$TERMUX_BUILDGO_FOLDER" ]; then return; fi
+
+       local TERMUX_BUILDGO_TAR=$TERMUX_COMMON_CACHEDIR/${TERMUX_GO_VERSION}.${TERMUX_GO_PLATFORM}.tar.gz
+       rm -Rf "$TERMUX_COMMON_CACHEDIR/go" "$TERMUX_BUILDGO_FOLDER"
+       termux_download https://storage.googleapis.com/golang/${TERMUX_GO_VERSION}.${TERMUX_GO_PLATFORM}.tar.gz \
+                       "$TERMUX_BUILDGO_TAR" \
+                       1862f4c3d3907e59b04a757cfda0ea7aa9ef39274af99a784f5be843c80c6772
+
+       ( cd "$TERMUX_COMMON_CACHEDIR"; tar xf "$TERMUX_BUILDGO_TAR"; mv go "$TERMUX_BUILDGO_FOLDER"; rm "$TERMUX_BUILDGO_TAR" )
+}
+
+# Utility function for cmake-built packages to setup a current cmake.
+termux_setup_cmake() {
+       local TERMUX_CMAKE_MAJORVESION=3.9
+       local TERMUX_CMAKE_MINORVERSION="0-rc6"
+       local TERMUX_CMAKE_VERSION=$TERMUX_CMAKE_MAJORVESION.$TERMUX_CMAKE_MINORVERSION
+       local TERMUX_CMAKE_TARNAME=cmake-${TERMUX_CMAKE_VERSION}-Linux-x86_64.tar.gz
+       local TERMUX_CMAKE_TARFILE=$TERMUX_PKG_TMPDIR/$TERMUX_CMAKE_TARNAME
+       local TERMUX_CMAKE_FOLDER=$TERMUX_COMMON_CACHEDIR/cmake-$TERMUX_CMAKE_VERSION
+       if [ ! -d "$TERMUX_CMAKE_FOLDER" ]; then
+               termux_download https://cmake.org/files/v$TERMUX_CMAKE_MAJORVESION/$TERMUX_CMAKE_TARNAME \
+                               "$TERMUX_CMAKE_TARFILE" \
+                               68456efed8207381c7724411558e7a3ed6503932f8f3127a3ba640e624026b1a
+               rm -Rf "$TERMUX_PKG_TMPDIR/cmake-${TERMUX_CMAKE_VERSION}-Linux-x86_64"
+               tar xf "$TERMUX_CMAKE_TARFILE" -C "$TERMUX_PKG_TMPDIR"
+               mv "$TERMUX_PKG_TMPDIR/cmake-${TERMUX_CMAKE_VERSION}-Linux-x86_64" \
+                  "$TERMUX_CMAKE_FOLDER"
+       fi
+       export PATH=$TERMUX_CMAKE_FOLDER/bin:$PATH
+       export CMAKE_INSTALL_ALWAYS=1
+}
+
+# First step is to handle command-line arguments. Not to be overridden by packages.
+termux_step_handle_arguments() {
+       # shellcheck source=/dev/null
+       test -f "$HOME/.termuxrc" && source "$HOME/.termuxrc"
+
+       # Handle command-line arguments:
+       _show_usage () {
+           echo "Usage: ./build-package.sh [-a ARCH] [-d] [-D] PACKAGE"
+           echo "Build a package by creating a .deb file in the debs/ folder."
+           echo "  -a The architecture to build for: aarch64(default), arm, i686, x86_64 or all."
+           echo "  -d Build with debug symbols."
+           echo "  -D Build a disabled package in disabled-packages/."
+           echo "  -f Force build even if package has already been built."
+           echo "  -s Skip dependency check."
+           exit 1
+       }
+       while getopts :a:hdDfs option; do
+               case "$option" in
+               a) TERMUX_ARCH="$OPTARG";;
+               h) _show_usage;;
+               d) TERMUX_DEBUG=true;;
+               D) local TERMUX_IS_DISABLED=true;;
+               f) TERMUX_FORCE_BUILD=true;;
+               s) export TERMUX_SKIP_DEPCHECK=true;;
+               ?) termux_error_exit "./build-package.sh: illegal option -$OPTARG";;
+               esac
+       done
+       shift $((OPTIND-1))
+
+       if [ "$#" -ne 1 ]; then _show_usage; fi
+       unset -f _show_usage
+
+       # Handle 'all' arch:
+       if [ -n "${TERMUX_ARCH+x}" ] && [ "${TERMUX_ARCH}" = 'all' ]; then
+               for arch in 'aarch64' 'arm' 'i686' 'x86_64'; do
+                       ./build-package.sh ${TERMUX_FORCE_BUILD+-f} -a $arch "$1"
+               done
+               exit
+       fi
+
+       # Check the package to build:
+       TERMUX_PKG_NAME=$(basename "$1")
+       export TERMUX_SCRIPTDIR
+       TERMUX_SCRIPTDIR=$(cd "$(dirname "$0")"; pwd)
+       if [[ $1 == *"/"* ]]; then
+               # Path to directory which may be outside this repo:
+               if [ ! -d "$1" ]; then termux_error_exit "'$1' seems to be a path but is not a directory"; fi
+               export TERMUX_PKG_BUILDER_DIR
+               TERMUX_PKG_BUILDER_DIR=$(realpath "$1")
+               # Skip depcheck for external package:
+               TERMUX_SKIP_DEPCHECK=true
+       else
+               # Package name:
+               if [ -n "${TERMUX_IS_DISABLED=""}" ]; then
+                       export TERMUX_PKG_BUILDER_DIR=$TERMUX_SCRIPTDIR/disabled-packages/$TERMUX_PKG_NAME
+               else
+                       export TERMUX_PKG_BUILDER_DIR=$TERMUX_SCRIPTDIR/packages/$TERMUX_PKG_NAME
+               fi
+       fi
+       TERMUX_PKG_BUILDER_SCRIPT=$TERMUX_PKG_BUILDER_DIR/build.sh
+       if test ! -f "$TERMUX_PKG_BUILDER_SCRIPT"; then
+               termux_error_exit "No build.sh script at package dir $TERMUX_PKG_BUILDER_DIR!"
+       fi
+}
+
+# Setup variables used by the build. Not to be overridden by packages.
+termux_step_setup_variables() {
+       : "${ANDROID_HOME:="${HOME}/lib/android-sdk"}"
+       : "${NDK:="${HOME}/lib/android-ndk"}"
+       : "${TERMUX_MAKE_PROCESSES:="$(nproc)"}"
+       : "${TERMUX_TOPDIR:="$HOME/.termux-build"}"
+       : "${TERMUX_ARCH:="aarch64"}" # arm, aarch64, i686 or x86_64.
+       : "${TERMUX_PREFIX:="/data/data/com.termux/files/usr"}"
+       : "${TERMUX_ANDROID_HOME:="/data/data/com.termux/files/home"}"
+       : "${TERMUX_DEBUG:=""}"
+       : "${TERMUX_PKG_API_LEVEL:="21"}"
+       : "${TERMUX_ANDROID_BUILD_TOOLS_VERSION:="25.0.3"}"
+       : "${TERMUX_NDK_VERSION:="15.1"}"
+
+       if [ "x86_64" = "$TERMUX_ARCH" ] || [ "aarch64" = "$TERMUX_ARCH" ]; then
+               TERMUX_ARCH_BITS=64
+       else
+               TERMUX_ARCH_BITS=32
+       fi
+
+       TERMUX_HOST_PLATFORM="${TERMUX_ARCH}-linux-android"
+       if [ "$TERMUX_ARCH" = "arm" ]; then TERMUX_HOST_PLATFORM="${TERMUX_HOST_PLATFORM}eabi"; fi
+
+       if [ ! -d "$NDK" ]; then
+               termux_error_exit 'NDK not pointing at a directory!'
+       fi
+       if ! grep -s -q "Pkg.Revision = $TERMUX_NDK_VERSION" "$NDK/source.properties"; then
+               termux_error_exit "Wrong NDK version - we need $TERMUX_NDK_VERSION"
+       fi
+
+       # The build tuple that may be given to --build configure flag:
+       TERMUX_BUILD_TUPLE=$(sh "$TERMUX_SCRIPTDIR/scripts/config.guess")
+
+       # We do not put all of build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/ into PATH
+       # to avoid stuff like arm-linux-androideabi-ld there to conflict with ones from
+       # the standalone toolchain.
+       TERMUX_DX=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/dx
+       TERMUX_JACK=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jack.jar
+       TERMUX_JILL=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jill.jar
+
+       TERMUX_COMMON_CACHEDIR="$TERMUX_TOPDIR/_cache"
+       TERMUX_DEBDIR="$TERMUX_SCRIPTDIR/debs"
+       TERMUX_ELF_CLEANER=$TERMUX_COMMON_CACHEDIR/termux-elf-cleaner
+
+       export prefix=${TERMUX_PREFIX}
+       export PREFIX=${TERMUX_PREFIX}
+
+       TERMUX_PKG_BUILDDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/build
+       TERMUX_PKG_CACHEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/cache
+       TERMUX_PKG_MASSAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/massage
+       TERMUX_PKG_PACKAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/package
+       TERMUX_PKG_SRCDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/src
+       TERMUX_PKG_SHA256=""
+       TERMUX_PKG_TMPDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/tmp
+       TERMUX_PKG_HOSTBUILD_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/host-build
+       TERMUX_PKG_PLATFORM_INDEPENDENT=""
+       TERMUX_PKG_NO_DEVELSPLIT=""
+       TERMUX_PKG_REVISION="0" # http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Version
+       TERMUX_PKG_EXTRA_CONFIGURE_ARGS=""
+       TERMUX_PKG_EXTRA_HOSTBUILD_CONFIGURE_ARGS=""
+       TERMUX_PKG_EXTRA_MAKE_ARGS=""
+       TERMUX_PKG_BUILD_IN_SRC=""
+       TERMUX_PKG_RM_AFTER_INSTALL=""
+       TERMUX_PKG_DEPENDS=""
+       TERMUX_PKG_HOMEPAGE=""
+       TERMUX_PKG_DESCRIPTION="FIXME:Add description"
+       TERMUX_PKG_FOLDERNAME=""
+       TERMUX_PKG_KEEP_STATIC_LIBRARIES="false"
+       TERMUX_PKG_ESSENTIAL=""
+       TERMUX_PKG_CONFLICTS="" # https://www.debian.org/doc/debian-policy/ch-relationships.html#s-conflicts
+       TERMUX_PKG_REPLACES=""
+       TERMUX_PKG_CONFFILES=""
+       TERMUX_PKG_INCLUDE_IN_DEVPACKAGE=""
+       TERMUX_PKG_DEVPACKAGE_DEPENDS=""
+       # Set if a host build should be done in TERMUX_PKG_HOSTBUILD_DIR:
+       TERMUX_PKG_HOSTBUILD=""
+       TERMUX_PKG_MAINTAINER="Fredrik Fornwall @fornwall"
+       TERMUX_PKG_CLANG=yes # does nothing for cmake based packages. clang is chosen by cmake
+       TERMUX_PKG_FORCE_CMAKE=no # if the package has autotools as well as cmake, then set this to prefer cmake
+
+       unset CFLAGS CPPFLAGS LDFLAGS CXXFLAGS
+}
+
+# Save away and restore build setups which may change between builds.
+termux_step_handle_buildarch() {
+       # If $TERMUX_PREFIX already exists, it may have been built for a different arch
+       local TERMUX_ARCH_FILE=/data/TERMUX_ARCH
+       if [ -f "${TERMUX_ARCH_FILE}" ]; then
+               local TERMUX_PREVIOUS_ARCH
+               TERMUX_PREVIOUS_ARCH=$(cat $TERMUX_ARCH_FILE)
+               if [ "$TERMUX_PREVIOUS_ARCH" != "$TERMUX_ARCH" ]; then
+                       local TERMUX_DATA_BACKUPDIRS=$TERMUX_TOPDIR/_databackups
+                       mkdir -p "$TERMUX_DATA_BACKUPDIRS"
+                       local TERMUX_DATA_PREVIOUS_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_PREVIOUS_ARCH
+                       local TERMUX_DATA_CURRENT_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_ARCH
+                       # Save current /data (removing old backup if any)
+                       if test -e "$TERMUX_DATA_PREVIOUS_BACKUPDIR"; then
+                               termux_error_exit "Directory already exists"
+                       fi
+                       if [ -d /data/data ]; then
+                               mv /data/data "$TERMUX_DATA_PREVIOUS_BACKUPDIR"
+                       fi
+                       # Restore new one (if any)
+                       if [ -d "$TERMUX_DATA_CURRENT_BACKUPDIR" ]; then
+                               mv "$TERMUX_DATA_CURRENT_BACKUPDIR" /data/data
+                       fi
+               fi
+       fi
+
+       # Keep track of current arch we are building for.
+       echo "$TERMUX_ARCH" > $TERMUX_ARCH_FILE
+}
+
+# Source the package build script and start building. No to be overridden by packages.
+termux_step_start_build() {
+       # shellcheck source=/dev/null
+       source "$TERMUX_PKG_BUILDER_SCRIPT"
+
+       TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_TOPDIR/_lib/${TERMUX_NDK_VERSION}-${TERMUX_ARCH}-${TERMUX_PKG_API_LEVEL}"
+       # Bump the below version if a change is made in toolchain setup to ensure
+       # that everyone gets an updated toolchain:
+       TERMUX_STANDALONE_TOOLCHAIN+="-v11"
+
+       if [ -n "${TERMUX_PKG_BLACKLISTED_ARCHES:=""}" ] && [ "$TERMUX_PKG_BLACKLISTED_ARCHES" != "${TERMUX_PKG_BLACKLISTED_ARCHES/$TERMUX_ARCH/}" ]; then
+               echo "Skipping building $TERMUX_PKG_NAME for arch $TERMUX_ARCH"
+               exit 0
+       fi
+
+       if [ -z "${TERMUX_SKIP_DEPCHECK:=""}" ]; then
+               local p TERMUX_ALL_DEPS
+               TERMUX_ALL_DEPS=$(./scripts/buildorder.py "$TERMUX_PKG_NAME")
+               for p in $TERMUX_ALL_DEPS; do
+                       if [ "$p" != "$TERMUX_PKG_NAME" ]; then
+                               echo "Building dependency $p if necessary..."
+                               ./build-package.sh -a $TERMUX_ARCH -s "$p"
+                       fi
+               done
+       fi
+
+       TERMUX_PKG_FULLVERSION=$TERMUX_PKG_VERSION
+       if [ "$TERMUX_PKG_REVISION" != "0" ] || [ "$TERMUX_PKG_FULLVERSION" != "${TERMUX_PKG_FULLVERSION/-/}" ]; then
+               # "0" is the default revision, so only include it if the upstream versions contains "-" itself
+               TERMUX_PKG_FULLVERSION+="-$TERMUX_PKG_REVISION"
+       fi
+
+       if [ -z "$TERMUX_DEBUG" ] &&
+          [ -z "${TERMUX_FORCE_BUILD+x}" ] &&
+          [ -e "/data/data/.built-packages/$TERMUX_PKG_NAME" ]; then
+               if [ "$(cat "/data/data/.built-packages/$TERMUX_PKG_NAME")" = "$TERMUX_PKG_FULLVERSION" ]; then
+                       echo "$TERMUX_PKG_NAME@$TERMUX_PKG_FULLVERSION built - skipping (rm /data/data/.built-packages/$TERMUX_PKG_NAME to force rebuild)"
+                       exit 0
+               fi
+       fi
+
+       # Cleanup old state:
+       rm -Rf "$TERMUX_PKG_BUILDDIR" \
+               "$TERMUX_PKG_PACKAGEDIR" \
+               "$TERMUX_PKG_SRCDIR" \
+               "$TERMUX_PKG_TMPDIR" \
+               "$TERMUX_PKG_MASSAGEDIR"
+
+       # Ensure folders present (but not $TERMUX_PKG_SRCDIR, it will be created in build)
+       mkdir -p "$TERMUX_COMMON_CACHEDIR" \
+               "$TERMUX_DEBDIR" \
+                "$TERMUX_PKG_BUILDDIR" \
+                "$TERMUX_PKG_PACKAGEDIR" \
+                "$TERMUX_PKG_TMPDIR" \
+                "$TERMUX_PKG_CACHEDIR" \
+                "$TERMUX_PKG_MASSAGEDIR" \
+                $TERMUX_PREFIX/{bin,etc,lib,libexec,share,tmp,include}
+
+       # Make $TERMUX_PREFIX/bin/sh executable on the builder, so that build
+       # scripts can assume that it works on both builder and host later on:
+       ln -f -s /bin/sh "$TERMUX_PREFIX/bin/sh"
+
+       local TERMUX_ELF_CLEANER_SRC=$TERMUX_COMMON_CACHEDIR/termux-elf-cleaner.cpp
+       local TERMUX_ELF_CLEANER_VERSION=$(bash -c ". $TERMUX_SCRIPTDIR/packages/termux-elf-cleaner/build.sh; echo \$TERMUX_PKG_VERSION")
+       termux_download \
+               https://raw.githubusercontent.com/termux/termux-elf-cleaner/v$TERMUX_ELF_CLEANER_VERSION/termux-elf-cleaner.cpp \
+               $TERMUX_ELF_CLEANER_SRC \
+               11a38372f4d0e36b7556382c7ecffecae35cee8b68daaee2dbee025f758e17ee
+       if [ "$TERMUX_ELF_CLEANER_SRC" -nt "$TERMUX_ELF_CLEANER" ]; then
+               g++ -std=c++11 -Wall -Wextra -pedantic -Os "$TERMUX_ELF_CLEANER_SRC" -o "$TERMUX_ELF_CLEANER"
+       fi
+
+       if [ -n "$TERMUX_PKG_BUILD_IN_SRC" ]; then
+               echo "Building in src due to TERMUX_PKG_BUILD_IN_SRC being set" > "$TERMUX_PKG_BUILDDIR/BUILDING_IN_SRC.txt"
+               TERMUX_PKG_BUILDDIR=$TERMUX_PKG_SRCDIR
+       fi
+
+       echo "termux - building $TERMUX_PKG_NAME for arch $TERMUX_ARCH..."
+       test -t 1 && printf "\033]0;%s...\007" "$TERMUX_PKG_NAME"
+
+       # Avoid exporting PKG_CONFIG_LIBDIR until after termux_step_host_build.
+       export TERMUX_PKG_CONFIG_LIBDIR=$TERMUX_PREFIX/lib/pkgconfig
+       # Add a pkg-config file for the system zlib.
+       mkdir -p "$TERMUX_PKG_CONFIG_LIBDIR"
+       cat > "$TERMUX_PKG_CONFIG_LIBDIR/zlib.pc" <<-HERE
+               Name: zlib
+               Description: zlib compression library
+               Version: 1.2.8
+               Requires:
+               Libs: -lz
+       HERE
+
+       # Keep track of when build started so we can see what files have been created.
+       # We start by sleeping so that any generated files above (such as zlib.pc) get
+       # an older timestamp than the TERMUX_BUILD_TS_FILE.
+       sleep 1
+       TERMUX_BUILD_TS_FILE=$TERMUX_PKG_TMPDIR/timestamp_$TERMUX_PKG_NAME
+       touch "$TERMUX_BUILD_TS_FILE"
+}
+
+# Run just after sourcing $TERMUX_PKG_BUILDER_SCRIPT. May be overridden by packages.
+termux_step_extract_package() {
+       if [ -z "${TERMUX_PKG_SRCURL:=""}" ]; then
+               mkdir -p "$TERMUX_PKG_SRCDIR"
+               return
+       fi
+       cd "$TERMUX_PKG_TMPDIR"
+       local filename
+       filename=$(basename "$TERMUX_PKG_SRCURL")
+       local file="$TERMUX_PKG_CACHEDIR/$filename"
+       termux_download "$TERMUX_PKG_SRCURL" "$file" "$TERMUX_PKG_SHA256"
 
        if [ "x$TERMUX_PKG_FOLDERNAME" = "x" ]; then
-               folder=`basename $filename .tar.bz2` && folder=`basename $folder .tar.gz` && folder=`basename $folder .tar.xz` && folder=`basename $folder .tar.lz` && folder=`basename $folder .tgz` && folder=`basename $folder .zip`
-               folder=`echo $folder | sed 's/_/-/'` # dpkg uses _ in tar filename, but - in folder
+               folder="${filename%%.t*}" && folder="${folder%%.zip}"
+               folder="${folder/_/-}" # dpkg uses _ in tar filename, but - in folder
        else
                folder=$TERMUX_PKG_FOLDERNAME
        fi
        rm -Rf $folder
-       if [ ${file##*.} = zip ]; then
-               unzip -q $file
+       if [ "${file##*.}" = zip ]; then
+               unzip -q "$file"
        else
-               $TERMUX_TAR xf $file
+               tar xf "$file"
        fi
-       mv $folder $TERMUX_PKG_SRCDIR
+       mv $folder "$TERMUX_PKG_SRCDIR"
 }
 
-termux_step_post_extract_package () {
+# Hook for packages to act just after the package has been extracted.
+# Invoked in $TERMUX_PKG_SRCDIR.
+termux_step_post_extract_package() {
         return
 }
 
+# Optional host build. Not to be overridden by packages.
+termux_step_handle_hostbuild() {
+       if [ "x$TERMUX_PKG_HOSTBUILD" = "x" ]; then return; fi
+
+       cd "$TERMUX_PKG_SRCDIR"
+       for patch in $TERMUX_PKG_BUILDER_DIR/*.patch.beforehostbuild; do
+               test -f "$patch" && sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" "$patch" | patch --silent -p1
+       done
+
+       local TERMUX_HOSTBUILD_MARKER="$TERMUX_PKG_HOSTBUILD_DIR/TERMUX_BUILT_FOR_$TERMUX_PKG_VERSION"
+       if [ ! -f "$TERMUX_HOSTBUILD_MARKER" ]; then
+               rm -Rf "$TERMUX_PKG_HOSTBUILD_DIR"
+               mkdir -p "$TERMUX_PKG_HOSTBUILD_DIR"
+               cd "$TERMUX_PKG_HOSTBUILD_DIR"
+               termux_step_host_build
+               touch "$TERMUX_HOSTBUILD_MARKER"
+       fi
+}
+
 # Perform a host build. Will be called in $TERMUX_PKG_HOSTBUILD_DIR.
 # After termux_step_post_extract_package() and before termux_step_patch_package()
-termux_step_host_build () {
-       $TERMUX_PKG_SRCDIR/configure ${TERMUX_PKG_EXTRA_HOSTBUILD_CONFIGURE_ARGS}
+termux_step_host_build() {
+       "$TERMUX_PKG_SRCDIR/configure" ${TERMUX_PKG_EXTRA_HOSTBUILD_CONFIGURE_ARGS}
        make -j $TERMUX_MAKE_PROCESSES
 }
 
-# This should not be overridden
-termux_step_patch_package () {
-       cd $TERMUX_PKG_SRCDIR
+# Setup a standalone Android NDK toolchain. Not to be overridden by packages.
+termux_step_setup_toolchain() {
+       # We put this after system PATH to avoid picking up toolchain stripped python
+       export PATH=$PATH:$TERMUX_STANDALONE_TOOLCHAIN/bin
+
+       export CFLAGS=""
+       export LDFLAGS="-L${TERMUX_PREFIX}/lib"
+
+       if [ "$TERMUX_PKG_CLANG" = "no" ]; then
+               export AS=${TERMUX_HOST_PLATFORM}-gcc
+               export CC=$TERMUX_HOST_PLATFORM-gcc
+               export CXX=$TERMUX_HOST_PLATFORM-g++
+               LDFLAGS+=" -specs=$TERMUX_SCRIPTDIR/termux.spec"
+               CFLAGS+=" -specs=$TERMUX_SCRIPTDIR/termux.spec"
+       else
+               export AS=${TERMUX_HOST_PLATFORM}-clang
+               export CC=$TERMUX_HOST_PLATFORM-clang
+               export CXX=$TERMUX_HOST_PLATFORM-clang++
+       fi
+
+       export AR=$TERMUX_HOST_PLATFORM-ar
+       export CPP=${TERMUX_HOST_PLATFORM}-cpp
+       export CC_FOR_BUILD=gcc
+       export LD=$TERMUX_HOST_PLATFORM-ld
+       export OBJDUMP=$TERMUX_HOST_PLATFORM-objdump
+       # Setup pkg-config for cross-compiling:
+       export PKG_CONFIG=$TERMUX_STANDALONE_TOOLCHAIN/bin/${TERMUX_HOST_PLATFORM}-pkg-config
+       export RANLIB=$TERMUX_HOST_PLATFORM-ranlib
+       export READELF=$TERMUX_HOST_PLATFORM-readelf
+       export STRIP=$TERMUX_HOST_PLATFORM-strip
+
+       # Android 7 started to support DT_RUNPATH (but not DT_RPATH), so we may want
+       # LDFLAGS+="-Wl,-rpath=$TERMUX_PREFIX/lib -Wl,--enable-new-dtags"
+       # and no longer remove DT_RUNPATH in termux-elf-cleaner.
+
+       if [ "$TERMUX_ARCH" = "arm" ]; then
+               # https://developer.android.com/ndk/guides/standalone_toolchain.html#abi_compatibility:
+               # "We recommend using the -mthumb compiler flag to force the generation of 16-bit Thumb-2 instructions".
+               # With r13 of the ndk ruby 2.4.0 segfaults when built on arm with clang without -mthumb.
+               CFLAGS+=" -march=armv7-a -mfpu=neon -mfloat-abi=softfp -mthumb"
+               LDFLAGS+=" -march=armv7-a"
+       elif [ "$TERMUX_ARCH" = "i686" ]; then
+               # From $NDK/docs/CPU-ARCH-ABIS.html:
+               CFLAGS+=" -march=i686 -msse3 -mstackrealign -mfpmath=sse"
+       elif [ "$TERMUX_ARCH" = "aarch64" ]; then
+               :
+       elif [ "$TERMUX_ARCH" = "x86_64" ]; then
+               :
+       else
+               termux_error_exit "Invalid arch '$TERMUX_ARCH' - support arches are 'arm', 'i686', 'aarch64', 'x86_64'"
+       fi
+
+       if [ -n "$TERMUX_DEBUG" ]; then
+               CFLAGS+=" -g3 -O1 -fstack-protector --param ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
+       else
+               CFLAGS+=" -Os"
+       fi
+
+       export CXXFLAGS="$CFLAGS"
+       export CPPFLAGS="-I${TERMUX_PREFIX}/include"
+
+       if [ "$TERMUX_PKG_DEPENDS" != "${TERMUX_PKG_DEPENDS/libandroid-support/}" ]; then
+               # If using the android support library, link to it and include its headers as system headers:
+               CPPFLAGS+=" -isystem $TERMUX_PREFIX/include/libandroid-support"
+               LDFLAGS+=" -landroid-support"
+       fi
+
+       export ac_cv_func_getpwent=no
+       export ac_cv_func_getpwnam=no
+       export ac_cv_func_getpwuid=no
+       export ac_cv_func_sigsetmask=no
+
+       if [ ! -d $TERMUX_STANDALONE_TOOLCHAIN ]; then
+               # Do not put toolchain in place until we are done with setup, to avoid having a half setup
+               # toolchain left in place if something goes wrong (or process is just aborted):
+               local _TERMUX_TOOLCHAIN_TMPDIR=${TERMUX_STANDALONE_TOOLCHAIN}-tmp
+               rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR
+
+               local _NDK_ARCHNAME=$TERMUX_ARCH
+               if [ "$TERMUX_ARCH" = "aarch64" ]; then
+                       _NDK_ARCHNAME=arm64
+               elif [ "$TERMUX_ARCH" = "i686" ]; then
+                       _NDK_ARCHNAME=x86
+               fi
+
+               "$NDK/build/tools/make_standalone_toolchain.py" \
+                       --api "$TERMUX_PKG_API_LEVEL" \
+                       --arch $_NDK_ARCHNAME \
+                       --stl=libc++ \
+                       --install-dir $_TERMUX_TOOLCHAIN_TMPDIR
+
+               # Remove android-support header wrapping not needed on android-21:
+               rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/local
+
+               local wrapped plusplus CLANG_TARGET=$TERMUX_HOST_PLATFORM
+               if [ $TERMUX_ARCH = arm ]; then CLANG_TARGET=${CLANG_TARGET/arm-/armv7a-}; fi
+               for wrapped in ${TERMUX_HOST_PLATFORM}-clang clang; do
+                       for plusplus in "" "++"; do
+                               local FILE_TO_REPLACE=$_TERMUX_TOOLCHAIN_TMPDIR/bin/${wrapped}${plusplus}
+                               if [ ! -f $FILE_TO_REPLACE ]; then
+                                       termux_error_exit "No toolchain file to override: $FILE_TO_REPLACE"
+                               fi
+                               cp "$TERMUX_SCRIPTDIR/scripts/clang-pie-wrapper" $FILE_TO_REPLACE
+                               sed -i "s/COMPILER/clang50$plusplus/" $FILE_TO_REPLACE
+                               sed -i "s/CLANG_TARGET/$CLANG_TARGET/" $FILE_TO_REPLACE
+                       done
+               done
+
+               if [ "$TERMUX_ARCH" = "aarch64" ]; then
+                       # Use gold by default to work around https://github.com/android-ndk/ndk/issues/148
+                       cp $_TERMUX_TOOLCHAIN_TMPDIR/bin/aarch64-linux-android-ld.gold \
+                          $_TERMUX_TOOLCHAIN_TMPDIR/bin/aarch64-linux-android-ld
+                       cp $_TERMUX_TOOLCHAIN_TMPDIR/aarch64-linux-android/bin/ld.gold \
+                          $_TERMUX_TOOLCHAIN_TMPDIR/aarch64-linux-android/bin/ld
+               fi
+
+               cd $_TERMUX_TOOLCHAIN_TMPDIR/sysroot
+
+               for f in $TERMUX_SCRIPTDIR/ndk-patches/*.patch; do
+                       sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" "$f" | \
+                               sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
+                               patch --silent -p1;
+               done
+               # elf.h: Taken from glibc since the elf.h in the NDK is lacking.
+               # sysexits.h: Header-only and used by a few programs.
+               # ifaddrs.h: Added in android-24 unified headers, use a inline implementation for now.
+               cp "$TERMUX_SCRIPTDIR"/ndk-patches/{elf.h,sysexits.h,ifaddrs.h} usr/include
+
+               # Remove <sys/shm.h> from the NDK in favour of that from the libandroid-shmem.
+               # Also remove <sys/sem.h> as it doesn't work for non-root.
+               rm usr/include/sys/{shm.h,sem.h}
+
+               sed -i "s/define __ANDROID_API__ __ANDROID_API_FUTURE__/define __ANDROID_API__ $TERMUX_PKG_API_LEVEL/" \
+                       usr/include/android/api-level.h
+
+               local _LIBDIR=usr/lib
+               if [ $TERMUX_ARCH = x86_64 ]; then _LIBDIR+=64; fi
+               $TERMUX_ELF_CLEANER $_LIBDIR/*.so
+
+               # zlib is really version 1.2.8 in the Android platform (at least
+               # starting from Android 5), not older as the NDK headers claim.
+               for file in zconf.h zlib.h; do
+                       curl -o usr/include/$file \
+                               https://raw.githubusercontent.com/madler/zlib/v1.2.8/$file
+               done
+               unset file
+               cd $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x
+                sed "s%\@TERMUX_HOST_PLATFORM\@%${TERMUX_HOST_PLATFORM}%g" $TERMUX_SCRIPTDIR/ndk-patches/*.cpppatch | patch -p1
+               mv $_TERMUX_TOOLCHAIN_TMPDIR $TERMUX_STANDALONE_TOOLCHAIN
+       fi
+
+       local _STL_LIBFILE_NAME=libc++_shared.so
+       if [ ! -f $TERMUX_PREFIX/lib/libstdc++.so ] || [ `readlink $TERMUX_PREFIX/lib/libstdc++.so` != $_STL_LIBFILE_NAME ]; then
+               # Setup libgnustl_shared.so in $PREFIX/lib and libstdc++.so as a symlink to it,
+               # so that other C++ using packages links to it instead of the default android
+               # C++ library which does not support exceptions or STL:
+               # https://developer.android.com/ndk/guides/cpp-support.html
+               # We do however want to avoid installing this, to avoid problems where e.g.
+               # libm.so on some i686 devices links against libstdc++.so.
+               # The libgnustl_shared.so library will be packaged in the libgnustl package
+               # which is part of the base Termux installation.
+               mkdir -p "$TERMUX_PREFIX/lib"
+               cd "$TERMUX_PREFIX/lib"
+
+               local _STL_LIBFILE=
+               if [ "$TERMUX_ARCH" = arm ]; then
+                       local _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/armv7-a/$_STL_LIBFILE_NAME
+               elif [ "$TERMUX_ARCH" = x86_64 ]; then
+                       local _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib64/$_STL_LIBFILE_NAME
+               else
+                       local _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/$_STL_LIBFILE_NAME
+               fi
+
+               cp "$_STL_LIBFILE" .
+               $STRIP --strip-unneeded $_STL_LIBFILE_NAME
+               $TERMUX_ELF_CLEANER $_STL_LIBFILE_NAME
+               ln -f -s $_STL_LIBFILE_NAME libstdc++.so
+       fi
+
+       export PKG_CONFIG_LIBDIR="$TERMUX_PKG_CONFIG_LIBDIR"
+       # Create a pkg-config wrapper. We use path to host pkg-config to
+       # avoid picking up a cross-compiled pkg-config later on.
+       local _HOST_PKGCONFIG
+       _HOST_PKGCONFIG=$(which pkg-config)
+       mkdir -p $TERMUX_STANDALONE_TOOLCHAIN/bin "$PKG_CONFIG_LIBDIR"
+       cat > "$PKG_CONFIG" <<-HERE
+               #!/bin/sh
+               export PKG_CONFIG_DIR=
+               export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR
+               exec $_HOST_PKGCONFIG "\$@"
+       HERE
+       chmod +x "$PKG_CONFIG"
+}
+
+# Apply all *.patch files for the package. Not to be overridden by packages.
+termux_step_patch_package() {
+       cd "$TERMUX_PKG_SRCDIR"
        # Suffix patch with ".patch32" or ".patch64" to only apply for these bitnesses:
+       shopt -s nullglob
        for patch in $TERMUX_PKG_BUILDER_DIR/*.patch{$TERMUX_ARCH_BITS,}; do
-               test -f $patch && sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $patch | \
+               test -f "$patch" && sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" "$patch" | \
                        sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
                        patch --silent -p1
        done
+       shopt -u nullglob
+}
 
-       find . -name config.sub -exec chmod u+w '{}' \; -exec cp $TERMUX_SCRIPTDIR/scripts/config.sub '{}' \;
-       find . -name config.guess -exec chmod u+w '{}' \; -exec cp $TERMUX_SCRIPTDIR/scripts/config.guess '{}' \;
+# Replace autotools build-aux/config.{sub,guess} with ours to add android targets.
+termux_step_replace_guess_scripts () {
+       cd "$TERMUX_PKG_SRCDIR"
+       find . -name config.sub -exec chmod u+w '{}' \; -exec cp "$TERMUX_SCRIPTDIR/scripts/config.sub" '{}' \;
+       find . -name config.guess -exec chmod u+w '{}' \; -exec cp "$TERMUX_SCRIPTDIR/scripts/config.guess" '{}' \;
 }
 
-termux_step_pre_configure () {
-        return
+# For package scripts to override. Called in $TERMUX_PKG_BUILDDIR.
+termux_step_pre_configure() {
+       return
 }
 
-termux_step_configure () {
-        if [ ! -e $TERMUX_PKG_SRCDIR/configure ]; then
-                return
-        fi
+termux_step_configure_autotools () {
+       if [ ! -e "$TERMUX_PKG_SRCDIR/configure" ]; then return; fi
 
        DISABLE_STATIC="--disable-static"
        if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--enable-static/}" ]; then
@@ -301,86 +688,173 @@ termux_step_configure () {
        if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--host=/}" ]; then
                HOST_FLAG=""
        fi
+       LIBEXEC_FLAG="--libexecdir=$TERMUX_PREFIX/libexec"
+        if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--libexecdir=/}" ]; then
+                LIBEXEC_FLAG=""
+        fi
 
        # Some packages provides a $PKG-config script which some configure scripts pickup instead of pkg-config:
-       mkdir $TERMUX_PKG_TMPDIR/config-scripts
+       mkdir "$TERMUX_PKG_TMPDIR/config-scripts"
        for f in $TERMUX_PREFIX/bin/*config; do
-               test -f $f && cp $f $TERMUX_PKG_TMPDIR/config-scripts
+               test -f "$f" && cp "$f" "$TERMUX_PKG_TMPDIR/config-scripts"
        done
        export PATH=$TERMUX_PKG_TMPDIR/config-scripts:$PATH
 
-       # See http://wiki.buici.com/xwiki/bin/view/Programing+C+and+C%2B%2B/Autoconf+and+RPL_MALLOC
-       # about this problem which may cause linker errors in test scripts not undef:ing malloc and
-       # also cause problems with e.g. malloc interceptors such as libgc:
-       local AVOID_AUTOCONF_WRAPPERS="ac_cv_func_malloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes"
-       # Similarly, disable gnulib's rpl_getcwd(). It returns the wrong value, affecting zile. See
-       # <https://github.com/termux/termux-packages/issues/76>.
-       AVOID_AUTOCONF_WRAPPERS+=" gl_cv_func_getcwd_null=yes gl_cv_func_getcwd_posix_signature=yes gl_cv_func_getcwd_path_max=yes gl_cv_func_getcwd_abort_bug=no"
-       AVOID_AUTOCONF_WRAPPERS+=" gl_cv_header_working_fcntl_h=yes gl_cv_func_fcntl_f_dupfd_cloexec=yes gl_cv_func_fcntl_f_dupfd_works=yes"
-       # Remove rpl_gettimeofday reference when building at least coreutils:
-       AVOID_AUTOCONF_WRAPPERS+=" gl_cv_func_tzset_clobber=no gl_cv_func_gettimeofday_clobber=no gl_cv_func_gettimeofday_posix_signature=yes"
-
-       env $AVOID_AUTOCONF_WRAPPERS $TERMUX_PKG_SRCDIR/configure \
+       # Avoid gnulib wrapping of functions when cross compiling. See
+       # http://wiki.osdev.org/Cross-Porting_Software#Gnulib
+       # https://gitlab.com/sortix/sortix/wikis/Gnulib
+       # https://github.com/termux/termux-packages/issues/76
+       local AVOID_GNULIB=""
+       AVOID_GNULIB+=" ac_cv_func_calloc_0_nonnull=yes"
+       AVOID_GNULIB+=" ac_cv_func_chown_works=yes"
+       AVOID_GNULIB+=" ac_cv_func_getgroups_works=yes"
+       AVOID_GNULIB+=" ac_cv_func_malloc_0_nonnull=yes"
+       AVOID_GNULIB+=" ac_cv_func_realloc_0_nonnull=yes"
+       AVOID_GNULIB+=" am_cv_func_working_getline=yes"
+       AVOID_GNULIB+=" gl_cv_func_dup2_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_fcntl_f_dupfd_cloexec=yes"
+       AVOID_GNULIB+=" gl_cv_func_fcntl_f_dupfd_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_fnmatch_posix=yes"
+       AVOID_GNULIB+=" gl_cv_func_getcwd_abort_bug=no"
+       AVOID_GNULIB+=" gl_cv_func_getcwd_null=yes"
+       AVOID_GNULIB+=" gl_cv_func_getcwd_path_max=yes"
+       AVOID_GNULIB+=" gl_cv_func_getcwd_posix_signature=yes"
+       AVOID_GNULIB+=" gl_cv_func_gettimeofday_clobber=no"
+       AVOID_GNULIB+=" gl_cv_func_gettimeofday_posix_signature=yes"
+       AVOID_GNULIB+=" gl_cv_func_link_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_lstat_dereferences_slashed_symlink=yes"
+       AVOID_GNULIB+=" gl_cv_func_malloc_0_nonnull=yes"
+       AVOID_GNULIB+=" gl_cv_func_memchr_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_mkdir_trailing_dot_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_mkdir_trailing_slash_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_mkfifo_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_realpath_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_select_detects_ebadf=yes"
+       AVOID_GNULIB+=" gl_cv_func_snprintf_posix=yes"
+       AVOID_GNULIB+=" gl_cv_func_snprintf_retval_c99=yes"
+       AVOID_GNULIB+=" gl_cv_func_snprintf_truncation_c99=yes"
+       AVOID_GNULIB+=" gl_cv_func_stat_dir_slash=yes"
+       AVOID_GNULIB+=" gl_cv_func_stat_file_slash=yes"
+       AVOID_GNULIB+=" gl_cv_func_strerror_0_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_symlink_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_tzset_clobber=no"
+       AVOID_GNULIB+=" gl_cv_func_unlink_honors_slashes=yes"
+       AVOID_GNULIB+=" gl_cv_func_unlink_honors_slashes=yes"
+       AVOID_GNULIB+=" gl_cv_func_vsnprintf_posix=yes"
+       AVOID_GNULIB+=" gl_cv_func_vsnprintf_zerosize_c99=yes"
+       AVOID_GNULIB+=" gl_cv_func_wcwidth_works=yes"
+       AVOID_GNULIB+=" gl_cv_func_working_getdelim=yes"
+       AVOID_GNULIB+=" gl_cv_func_working_mkstemp=yes"
+       AVOID_GNULIB+=" gl_cv_func_working_mktime=yes"
+       AVOID_GNULIB+=" gl_cv_func_working_strerror=yes"
+       AVOID_GNULIB+=" gl_cv_header_working_fcntl_h=yes"
+       AVOID_GNULIB+=" gl_cv_C_locale_sans_EILSEQ=yes"
+
+       # NOTE: We do not want to quote AVOID_GNULIB as we want word expansion.
+       env $AVOID_GNULIB "$TERMUX_PKG_SRCDIR/configure" \
                --disable-dependency-tracking \
                --prefix=$TERMUX_PREFIX \
-                --disable-rpath --disable-rpath-hack \
+               --disable-rpath --disable-rpath-hack \
                $HOST_FLAG \
                $TERMUX_PKG_EXTRA_CONFIGURE_ARGS \
                $DISABLE_NLS \
                $ENABLE_SHARED \
                $DISABLE_STATIC \
-               --libexecdir=$TERMUX_PREFIX/libexec
+               $LIBEXEC_FLAG
 }
 
-termux_step_post_configure () {
-        return
+termux_step_configure_cmake () {
+       termux_setup_cmake
+
+       local TOOLCHAIN_ARGS="-DCMAKE_ANDROID_STANDALONE_TOOLCHAIN=$TERMUX_STANDALONE_TOOLCHAIN"
+       local BUILD_TYPE=MinSizeRel
+       test -n "$TERMUX_DEBUG" && BUILD_TYPE=Debug
+
+       local CMAKE_PROC=$TERMUX_ARCH
+       test $CMAKE_PROC == "arm" && CMAKE_PROC='armv7-a'
+
+       # XXX: CMAKE_{AR,RANLIB} needed for at least jsoncpp build to not
+       # pick up cross compiled binutils tool in $PREFIX/bin:
+       cmake -G 'Unix Makefiles' "$TERMUX_PKG_SRCDIR" \
+               -DCMAKE_AR="$(which $AR)" \
+               -DCMAKE_UNAME="$(which uname)" \
+               -DCMAKE_RANLIB="$(which $RANLIB)" \
+               -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
+               -DCMAKE_CROSSCOMPILING=True \
+               -DCMAKE_C_FLAGS="$CFLAGS $CPPFLAGS" \
+               -DCMAKE_CXX_FLAGS="$CXXFLAGS $CPPFLAGS" \
+               -DCMAKE_LINKER="$TERMUX_STANDALONE_TOOLCHAIN/bin/$LD $LDFLAGS" \
+               -DCMAKE_FIND_ROOT_PATH=$TERMUX_PREFIX \
+               -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
+               -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
+               -DCMAKE_INSTALL_PREFIX=$TERMUX_PREFIX \
+               -DCMAKE_MAKE_PROGRAM=`which make` \
+               -DCMAKE_SYSTEM_PROCESSOR=$CMAKE_PROC \
+               -DCMAKE_SYSTEM_NAME=Android \
+               -DCMAKE_SYSTEM_VERSION=21 \
+               -DCMAKE_SKIP_INSTALL_RPATH=ON \
+               -DCMAKE_USE_SYSTEM_LIBRARIES=True \
+               -DBUILD_TESTING=OFF \
+               $TERMUX_PKG_EXTRA_CONFIGURE_ARGS $TOOLCHAIN_ARGS
 }
 
-termux_step_pre_make () {
-        return
+termux_step_configure () {
+       if [ "$TERMUX_PKG_FORCE_CMAKE" == 'no' ] && [ -f "$TERMUX_PKG_SRCDIR/configure" ]; then
+               termux_step_configure_autotools
+       elif [ -f "$TERMUX_PKG_SRCDIR/CMakeLists.txt" ]; then
+               termux_step_configure_cmake
+       fi
 }
 
-termux_step_make () {
-        if ls *akefile &> /dev/null; then
-                if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
-                        make -j $TERMUX_MAKE_PROCESSES
-                else
-                        make -j $TERMUX_MAKE_PROCESSES ${TERMUX_PKG_EXTRA_MAKE_ARGS}
-                fi
-        fi
+termux_step_post_configure () {
+       return
 }
 
-termux_step_make_install () {
-        if ls *akefile &> /dev/null; then
-                : ${TERMUX_PKG_MAKE_INSTALL_TARGET:="install"}:
-                # Some packages have problem with parallell install, and it does not buy much, so use -j 1.
-                if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
-                        make -j 1 ${TERMUX_PKG_MAKE_INSTALL_TARGET}
-                else
-                        make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}
-                fi
-        fi
+termux_step_make() {
+       if ls ./*akefile &> /dev/null; then
+               if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
+                       make -j $TERMUX_MAKE_PROCESSES
+               else
+                       make -j $TERMUX_MAKE_PROCESSES ${TERMUX_PKG_EXTRA_MAKE_ARGS}
+               fi
+       fi
 }
 
-termux_step_post_make_install () {
-        return
+termux_step_make_install() {
+       if ls ./*akefile &> /dev/null; then
+               : "${TERMUX_PKG_MAKE_INSTALL_TARGET:="install"}"
+               # Some packages have problem with parallell install, and it does not buy much, so use -j 1.
+               if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
+                       make -j 1 ${TERMUX_PKG_MAKE_INSTALL_TARGET}
+               else
+                       make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}
+               fi
+       fi
+}
+
+# Hook function for package scripts to override.
+termux_step_post_make_install() {
+       return
 }
 
-termux_step_extract_into_massagedir () {
-       TARBALL_ORIG=$TERMUX_PKG_PACKAGEDIR/${TERMUX_PKG_NAME}_orig.tar.gz
+termux_step_extract_into_massagedir() {
+       local TARBALL_ORIG=$TERMUX_PKG_PACKAGEDIR/${TERMUX_PKG_NAME}_orig.tar.gz
 
        # Build diff tar with what has changed during the build:
        cd $TERMUX_PREFIX
-       $TERMUX_TAR -N $TERMUX_BUILD_TS_FILE -czf $TARBALL_ORIG .
+       tar -N "$TERMUX_BUILD_TS_FILE" \
+               --exclude='lib/libc++_shared.so' --exclude='lib/libstdc++.so' \
+               -czf "$TARBALL_ORIG" .
 
        # Extract tar in order to massage it
-       mkdir -p $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX
-       cd $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX
-       $TERMUX_TAR xf $TARBALL_ORIG
+       mkdir -p "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
+       cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
+       tar xf "$TARBALL_ORIG"
+       rm "$TARBALL_ORIG"
 }
 
-termux_step_massage () {
-       cd $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX
+termux_step_massage() {
+       cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
 
        # Remove lib/charset.alias which is installed by gettext-using packages:
        rm -f lib/charset.alias
@@ -388,14 +862,14 @@ termux_step_massage () {
        # Remove non-english man pages:
        test -d share/man && (cd share/man; for f in `ls | grep -v man`; do rm -Rf $f; done )
 
-       if [ -z ${TERMUX_PKG_KEEP_INFOPAGES+x} ]; then
+       if [ -z "${TERMUX_PKG_KEEP_INFOPAGES+x}" ]; then
                # Remove info pages:
                rm -Rf share/info
        fi
 
        # Remove locale files we're not interested in::
        rm -Rf share/locale
-       if [ -z ${TERMUX_PKG_KEEP_SHARE_DOC+x} ]; then
+       if [ -z "${TERMUX_PKG_KEEP_SHARE_DOC+x}" ]; then
                # Remove info pages:
                rm -Rf share/doc
        fi
@@ -410,500 +884,224 @@ termux_step_massage () {
        fi
 
        # Move over sbin to bin:
-       for file in sbin/*; do if test -f $file; then mv $file bin/; fi; done
+       for file in sbin/*; do if test -f "$file"; then mv "$file" bin/; fi; done
 
-        # Remove world permissions and add write permissions.
+       # Remove world permissions and add write permissions.
        # The -f flag is used to suppress warnings about dangling symlinks (such
        # as ones to /system/... which may not exist on the build machine):
-        find . -exec chmod -f u+w,o-rwx \{\} \;
+        find . -exec chmod -f u+w,g-rwx,o-rwx \{\} \;
+
        if [ "$TERMUX_DEBUG" = "" ]; then
                # Strip binaries. file(1) may fail for certain unusual files, so disable pipefail.
                set +e +o pipefail
                find . -type f | xargs -r file | grep -E "(executable|shared object)" | grep ELF | cut -f 1 -d : | \
-                       xargs -r $STRIP --strip-unneeded --preserve-dates
+                       xargs -r "$STRIP" --strip-unneeded --preserve-dates
                set -e -o pipefail
        fi
        # Remove DT_ entries which the android 5.1 linker warns about:
-       find . -type f -print0 | xargs -r -0 $TERMUX_ELF_CLEANER
+       find . -type f -print0 | xargs -r -0 "$TERMUX_ELF_CLEANER"
 
        # Fix shebang paths:
-       for file in `find -L . -type f`; do
-               head -c 100 $file | grep -E "^#\!.*\\/bin\\/.*" | grep -q -E -v "^#\! ?\\/system" && sed --follow-symlinks -i -E "1 s@^#\!(.*)/bin/(.*)@#\!$TERMUX_PREFIX/bin/\2@" $file
-       done
+       while IFS= read -r -d '' file
+       do
+               head -c 100 "$file" | grep -E "^#\!.*\\/bin\\/.*" | grep -q -E -v "^#\! ?\\/system" && sed --follow-symlinks -i -E "1 s@^#\!(.*)/bin/(.*)@#\!$TERMUX_PREFIX/bin/\2@" "$file"
+       done < <(find -L . -type f -print0)
 
        test ! -z "$TERMUX_PKG_RM_AFTER_INSTALL" && rm -Rf $TERMUX_PKG_RM_AFTER_INSTALL
 
        find . -type d -empty -delete # Remove empty directories
 
-        # Sub packages:
-        if [ -d include -a -z "${TERMUX_PKG_NO_DEVELSPLIT}" ]; then
-                # Add virtual -dev sub package if there are include files:
-                _DEVEL_SUBPACKAGE_FILE=$TERMUX_PKG_TMPDIR/${TERMUX_PKG_NAME}-dev.subpackage.sh
-                echo TERMUX_SUBPKG_INCLUDE=\"include share/man/man3 lib/pkgconfig share/aclocal $TERMUX_PKG_INCLUDE_IN_DEVPACKAGE\" > $_DEVEL_SUBPACKAGE_FILE
-                echo TERMUX_SUBPKG_DESCRIPTION=\"Development files for ${TERMUX_PKG_NAME}\" >> $_DEVEL_SUBPACKAGE_FILE
+       # Sub packages:
+       if [ -d include ] && [ -z "${TERMUX_PKG_NO_DEVELSPLIT}" ]; then
+               # Add virtual -dev sub package if there are include files:
+               local _DEVEL_SUBPACKAGE_FILE=$TERMUX_PKG_TMPDIR/${TERMUX_PKG_NAME}-dev.subpackage.sh
+               echo TERMUX_SUBPKG_INCLUDE=\"include share/vala share/man/man3 lib/pkgconfig share/aclocal lib/cmake $TERMUX_PKG_INCLUDE_IN_DEVPACKAGE\" > "$_DEVEL_SUBPACKAGE_FILE"
+               echo "TERMUX_SUBPKG_DESCRIPTION=\"Development files for ${TERMUX_PKG_NAME}\"" >> "$_DEVEL_SUBPACKAGE_FILE"
                if [ -n "$TERMUX_PKG_DEVPACKAGE_DEPENDS" ]; then
-                       echo TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME,$TERMUX_PKG_DEVPACKAGE_DEPENDS\" >> $_DEVEL_SUBPACKAGE_FILE
+                       echo "TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME,$TERMUX_PKG_DEVPACKAGE_DEPENDS\"" >> "$_DEVEL_SUBPACKAGE_FILE"
                else
-                       echo TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME\" >> $_DEVEL_SUBPACKAGE_FILE
-               fi
-               if [ x$TERMUX_PKG_CONFLICTS != x ]; then
-                       # Assume that dev packages conflicts as well.
-                       echo "TERMUX_SUBPKG_CONFLICTS=${TERMUX_PKG_CONFLICTS}-dev" >> $_DEVEL_SUBPACKAGE_FILE
+                       echo "TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME\"" >> "$_DEVEL_SUBPACKAGE_FILE"
                fi
-        fi
-        # Now build all sub packages
-        rm -Rf $TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages
+       fi
+       # Now build all sub packages
+       rm -Rf "$TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages"
        for subpackage in $TERMUX_PKG_BUILDER_DIR/*.subpackage.sh $TERMUX_PKG_TMPDIR/*subpackage.sh; do
-                test ! -f $subpackage && continue
-               SUB_PKG_NAME=`basename $subpackage .subpackage.sh`
-                # Default value is same as main package, but sub package may override:
-                TERMUX_SUBPKG_PLATFORM_INDEPENDENT=$TERMUX_PKG_PLATFORM_INDEPENDENT
-                SUB_PKG_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages/$SUB_PKG_NAME
-                TERMUX_SUBPKG_DEPENDS=""
-               TERMUX_SUBPKG_CONFLICTS=""
-                SUB_PKG_MASSAGE_DIR=$SUB_PKG_DIR/massage/$TERMUX_PREFIX
-               SUB_PKG_PACKAGE_DIR=$SUB_PKG_DIR/package
-                mkdir -p $SUB_PKG_MASSAGE_DIR $SUB_PKG_PACKAGE_DIR
-
-                . $subpackage
-
-                for includeset in $TERMUX_SUBPKG_INCLUDE; do
-                        _INCLUDE_DIRSET=`dirname $includeset`
-                        test "$_INCLUDE_DIRSET" = "." && _INCLUDE_DIRSET=""
-                        if [ -e $includeset -o -L $includeset ]; then
+               test ! -f "$subpackage" && continue
+               local SUB_PKG_NAME
+               SUB_PKG_NAME=$(basename "$subpackage" .subpackage.sh)
+               # Default value is same as main package, but sub package may override:
+               local TERMUX_SUBPKG_PLATFORM_INDEPENDENT=$TERMUX_PKG_PLATFORM_INDEPENDENT
+               local SUB_PKG_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages/$SUB_PKG_NAME
+               local TERMUX_SUBPKG_DEPENDS=""
+               local TERMUX_SUBPKG_CONFLICTS=""
+               local TERMUX_SUBPKG_CONFFILES=""
+               local SUB_PKG_MASSAGE_DIR=$SUB_PKG_DIR/massage/$TERMUX_PREFIX
+               local SUB_PKG_PACKAGE_DIR=$SUB_PKG_DIR/package
+               mkdir -p "$SUB_PKG_MASSAGE_DIR" "$SUB_PKG_PACKAGE_DIR"
+
+               # shellcheck source=/dev/null
+               source $subpackage
+
+               for includeset in $TERMUX_SUBPKG_INCLUDE; do
+                       local _INCLUDE_DIRSET
+                       _INCLUDE_DIRSET=$(dirname "$includeset")
+                       test "$_INCLUDE_DIRSET" = "." && _INCLUDE_DIRSET=""
+                       if [ -e "$includeset" ] || [ -L "$includeset" ]; then
                                # Add the -L clause to handle relative symbolic links:
-                                mkdir -p $SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET
-                                mv $includeset $SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET
-                        fi
-                done
+                               mkdir -p "$SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET"
+                               mv "$includeset" "$SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET"
+                       fi
+               done
 
-                SUB_PKG_ARCH=$TERMUX_ARCH
-                test -n "$TERMUX_SUBPKG_PLATFORM_INDEPENDENT" && SUB_PKG_ARCH=all
+               local SUB_PKG_ARCH=$TERMUX_ARCH
+               test -n "$TERMUX_SUBPKG_PLATFORM_INDEPENDENT" && SUB_PKG_ARCH=all
 
-                cd $SUB_PKG_DIR/massage
-                SUB_PKG_INSTALLSIZE=`du -sk . | cut -f 1`
-               $TERMUX_TAR -cJf $SUB_PKG_PACKAGE_DIR/data.tar.xz .
+               cd "$SUB_PKG_DIR/massage"
+               local SUB_PKG_INSTALLSIZE
+               SUB_PKG_INSTALLSIZE=$(du -sk . | cut -f 1)
+               tar -cJf "$SUB_PKG_PACKAGE_DIR/data.tar.xz" .
 
-                mkdir -p DEBIAN
+               mkdir -p DEBIAN
                cd DEBIAN
-                cat > control <<HERE
-Package: $SUB_PKG_NAME
-Architecture: ${SUB_PKG_ARCH}
-Installed-Size: ${SUB_PKG_INSTALLSIZE}
-Maintainer: $TERMUX_PKG_MAINTAINER
-Version: $TERMUX_PKG_FULLVERSION
-Description: $TERMUX_SUBPKG_DESCRIPTION
-Homepage: $TERMUX_PKG_HOMEPAGE
-HERE
-                test ! -z "$TERMUX_SUBPKG_DEPENDS" && echo "Depends: $TERMUX_SUBPKG_DEPENDS" >> control
-                test ! -z "$TERMUX_SUBPKG_CONFLICTS" && echo "Conflicts: $TERMUX_SUBPKG_CONFLICTS" >> control
-               $TERMUX_TAR -cJf $SUB_PKG_PACKAGE_DIR/control.tar.xz .
-
-                # Create the actual .deb file:
-                TERMUX_SUBPKG_DEBFILE=$TERMUX_DEBDIR/${SUB_PKG_NAME}_${TERMUX_PKG_FULLVERSION}_${SUB_PKG_ARCH}.deb
-               ar cr $TERMUX_SUBPKG_DEBFILE \
-                                  $TERMUX_COMMON_CACHEDIR/debian-binary \
-                                  $SUB_PKG_PACKAGE_DIR/control.tar.xz \
-                                  $SUB_PKG_PACKAGE_DIR/data.tar.xz
-                if [ "$TERMUX_PROCESS_DEB" != "" ]; then
-                       $TERMUX_PROCESS_DEB $TERMUX_SUBPKG_DEBFILE
-                fi
-
-                # Go back to main package:
-               cd $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX
+               cat > control <<-HERE
+                       Package: $SUB_PKG_NAME
+                       Architecture: ${SUB_PKG_ARCH}
+                       Installed-Size: ${SUB_PKG_INSTALLSIZE}
+                       Maintainer: $TERMUX_PKG_MAINTAINER
+                       Version: $TERMUX_PKG_FULLVERSION
+                       Description: $TERMUX_SUBPKG_DESCRIPTION
+                       Homepage: $TERMUX_PKG_HOMEPAGE
+               HERE
+               test ! -z "$TERMUX_SUBPKG_DEPENDS" && echo "Depends: $TERMUX_SUBPKG_DEPENDS" >> control
+               test ! -z "$TERMUX_SUBPKG_CONFLICTS" && echo "Conflicts: $TERMUX_SUBPKG_CONFLICTS" >> control
+               tar -cJf "$SUB_PKG_PACKAGE_DIR/control.tar.xz" .
+
+               for f in $TERMUX_SUBPKG_CONFFILES; do echo "$TERMUX_PREFIX/$f" >> conffiles; done
+
+               # Create the actual .deb file:
+               TERMUX_SUBPKG_DEBFILE=$TERMUX_DEBDIR/${SUB_PKG_NAME}_${TERMUX_PKG_FULLVERSION}_${SUB_PKG_ARCH}.deb
+               test ! -f "$TERMUX_COMMON_CACHEDIR/debian-binary" && echo "2.0" > "$TERMUX_COMMON_CACHEDIR/debian-binary"
+               ar cr "$TERMUX_SUBPKG_DEBFILE" \
+                                  "$TERMUX_COMMON_CACHEDIR/debian-binary" \
+                                  "$SUB_PKG_PACKAGE_DIR/control.tar.xz" \
+                                  "$SUB_PKG_PACKAGE_DIR/data.tar.xz"
+
+               # Go back to main package:
+               cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
        done
 
        # .. remove empty directories (NOTE: keep this last):
        find . -type d -empty -delete
-        # Make sure user can read and write all files (problem with dpkg otherwise):
-        chmod -R u+rw .
+       # Make sure user can read and write all files (problem with dpkg otherwise):
+       chmod -R u+rw .
 }
 
-termux_step_post_massage () {
-        return
+termux_step_post_massage() {
+       return
 }
 
-termux_step_create_debscripts () {
-        return
-}
+# Create data.tar.gz with files to package. Not to be overridden by package scripts.
+termux_step_create_datatar() {
+       # Create data tarball containing files to package:
+       cd "$TERMUX_PKG_MASSAGEDIR"
 
-termux_setup_golang () {
-       export GOOS=android
-       export CGO_ENABLED=1
-       export GO_LDFLAGS="-extldflags=-pie"
-       if [ "$TERMUX_ARCH" = "arm" ]; then
-               export GOARCH=arm
-               export GOARM=7
-       elif [ "$TERMUX_ARCH" = "i686" ]; then
-               export GOARCH=386
-               export GO386=sse2
-       elif [ "$TERMUX_ARCH" = "aarch64" ]; then
-               export GOARCH=arm64
-       elif [ "$TERMUX_ARCH" = "x86_64" ]; then
-               export GOARCH=amd64
-       else
-               echo "ERROR: Unsupported arch: $TERMUX_ARCH"
-               exit 1
+       local HARDLINKS="$(find . -type f -links +1)"
+       if [ -n "$HARDLINKS" ]; then
+               termux_error_exit "Package contains hard links: $HARDLINKS"
        fi
 
-       local TERMUX_GO_VERSION=go1.7.4
-       local TERMUX_GO_PLATFORM=linux-amd64
-       test `uname` = "Darwin" && TERMUX_GO_PLATFORM=darwin-amd64
-
-       export TERMUX_BUILDGO_FOLDER=$TERMUX_COMMON_CACHEDIR/${TERMUX_GO_VERSION}.${TERMUX_GO_PLATFORM}
-       export GOROOT=$TERMUX_BUILDGO_FOLDER
-       export PATH=$GOROOT/bin:$PATH
-
-       if [ -d $TERMUX_BUILDGO_FOLDER ]; then return; fi
-
-       local TERMUX_BUILDGO_TAR=$TERMUX_COMMON_CACHEDIR/${TERMUX_GO_VERSION}.${TERMUX_GO_PLATFORM}.tar.gz
-       rm -Rf $TERMUX_COMMON_CACHEDIR/go $TERMUX_BUILDGO_FOLDER
-       termux_download https://storage.googleapis.com/golang/${TERMUX_GO_VERSION}.${TERMUX_GO_PLATFORM}.tar.gz $TERMUX_BUILDGO_TAR
-        ( cd $TERMUX_COMMON_CACHEDIR; tar xf $TERMUX_BUILDGO_TAR; mv go $TERMUX_BUILDGO_FOLDER; rm $TERMUX_BUILDGO_TAR )
+       if [ -z "${TERMUX_PKG_METAPACKAGE+x}" ] && [ "$(find . -type f)" = "" ]; then
+               termux_error_exit "No files in package"
+       fi
+       tar -cJf "$TERMUX_PKG_PACKAGEDIR/data.tar.xz" .
 }
 
-source $TERMUX_PKG_BUILDER_SCRIPT
+termux_step_create_debscripts() {
+       return
+}
 
-if [ -n "${TERMUX_PKG_BLACKLISTED_ARCHES:=""}" -a "$TERMUX_PKG_BLACKLISTED_ARCHES" != "${TERMUX_PKG_BLACKLISTED_ARCHES/$TERMUX_ARCH/}" ]; then
-       echo "Skipping building $TERMUX_PKG_NAME for arch $TERMUX_ARCH"
-       exit 0
-fi
+# Create the build deb file. Not to be overridden by package scripts.
+termux_step_create_debfile() {
+       # Get install size. This will be written as the "Installed-Size" deb field so is measured in 1024-byte blocks:
+       local TERMUX_PKG_INSTALLSIZE
+       TERMUX_PKG_INSTALLSIZE=$(du -sk . | cut -f 1)
+
+       # From here on TERMUX_ARCH is set to "all" if TERMUX_PKG_PLATFORM_INDEPENDENT is set by the package
+       test -n "$TERMUX_PKG_PLATFORM_INDEPENDENT" && TERMUX_ARCH=all
+
+       mkdir -p DEBIAN
+       cat > DEBIAN/control <<-HERE
+               Package: $TERMUX_PKG_NAME
+               Architecture: ${TERMUX_ARCH}
+               Installed-Size: ${TERMUX_PKG_INSTALLSIZE}
+               Maintainer: $TERMUX_PKG_MAINTAINER
+               Version: $TERMUX_PKG_FULLVERSION
+               Description: $TERMUX_PKG_DESCRIPTION
+               Homepage: $TERMUX_PKG_HOMEPAGE
+       HERE
+       test ! -z "$TERMUX_PKG_DEPENDS" && echo "Depends: $TERMUX_PKG_DEPENDS" >> DEBIAN/control
+       test ! -z "$TERMUX_PKG_ESSENTIAL" && echo "Essential: yes" >> DEBIAN/control
+       test ! -z "$TERMUX_PKG_CONFLICTS" && echo "Conflicts: $TERMUX_PKG_CONFLICTS" >> DEBIAN/control
+       test ! -z "$TERMUX_PKG_REPLACES" && echo "Replaces: $TERMUX_PKG_REPLACES" >> DEBIAN/control
+
+       # Create DEBIAN/conffiles (see https://www.debian.org/doc/debian-policy/ap-pkg-conffiles.html):
+       for f in $TERMUX_PKG_CONFFILES; do echo "$TERMUX_PREFIX/$f" >> DEBIAN/conffiles; done
+
+       # Allow packages to create arbitrary control files.
+       # XXX: Should be done in a better way without a function?
+       cd DEBIAN
+       termux_step_create_debscripts
+
+       # Create control.tar.xz
+       tar -cJf "$TERMUX_PKG_PACKAGEDIR/control.tar.xz" .
+
+       test ! -f "$TERMUX_COMMON_CACHEDIR/debian-binary" && echo "2.0" > "$TERMUX_COMMON_CACHEDIR/debian-binary"
+       TERMUX_PKG_DEBFILE=$TERMUX_DEBDIR/${TERMUX_PKG_NAME}_${TERMUX_PKG_FULLVERSION}_${TERMUX_ARCH}.deb
+       # Create the actual .deb file:
+       ar cr "$TERMUX_PKG_DEBFILE" \
+              "$TERMUX_COMMON_CACHEDIR/debian-binary" \
+              "$TERMUX_PKG_PACKAGEDIR/control.tar.xz" \
+              "$TERMUX_PKG_PACKAGEDIR/data.tar.xz"
+}
 
-if [ -z "${TERMUX_SKIP_DEPCHECK:=""}" ]; then
-       for p in `./scripts/buildorder.py $TERMUX_PKG_NAME`; do
-               if [ "$p" != "$TERMUX_PKG_NAME" ]; then
-                       echo "Building dependency $p if necessary..."
-                       ./build-package.sh -s $p
-               fi
-       done
-fi
-
-# Compute full version:
-TERMUX_PKG_FULLVERSION=$TERMUX_PKG_VERSION
-if [ "$TERMUX_PKG_BUILD_REVISION" != "0" -o "$TERMUX_PKG_FULLVERSION" != "${TERMUX_PKG_FULLVERSION/-/}" ]; then
-       # "0" is the default revision, so only include it if the upstream versions contains "-" itself
-       TERMUX_PKG_FULLVERSION+="-$TERMUX_PKG_BUILD_REVISION"
-fi
-
-if [ -z "$TERMUX_DEBUG" -a -e "/data/data/.built-packages/$TERMUX_PKG_NAME" ]; then
-       if [ "`cat /data/data/.built-packages/$TERMUX_PKG_NAME`" = "$TERMUX_PKG_FULLVERSION" ]; then
-               echo "$TERMUX_PKG_NAME@$TERMUX_PKG_FULLVERSION built - skipping (rm /data/data/.built-packages/$TERMUX_PKG_NAME to force rebuild)"
+# Finish the build. Not to be overridden by package scripts.
+termux_step_finish_build() {
+       echo "termux - build of '$TERMUX_PKG_NAME' done"
+       test -t 1 && printf "\033]0;%s - DONE\007" "$TERMUX_PKG_NAME"
+       mkdir -p /data/data/.built-packages
+       echo "$TERMUX_PKG_FULLVERSION" > "/data/data/.built-packages/$TERMUX_PKG_NAME"
        exit 0
-       fi
-fi
-
-echo "termux - building $1 for arch $TERMUX_ARCH..."
-test -t 1 && printf "\033]0;%s...\007" "$1"
-
-# Compute standalone toolchain dir, bitness of arch and name of host platform:
-TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_TOPDIR/_lib/toolchain-${TERMUX_ARCH}-ndk${TERMUX_NDK_VERSION}-api${TERMUX_API_LEVEL}"
-# Bump the below version if a change is made in toolchain setup to ensure
-# that everyone gets an updated toolchain:
-TERMUX_STANDALONE_TOOLCHAIN+="-v3"
-
-# We put this after system PATH to avoid picking up toolchain stripped python
-export PATH=$PATH:$TERMUX_STANDALONE_TOOLCHAIN/bin
-
-export AR=$TERMUX_HOST_PLATFORM-ar
-if [ "$TERMUX_PKG_CLANG" = "no" ]; then
-       export AS=${TERMUX_HOST_PLATFORM}-gcc
-       export CC=$TERMUX_HOST_PLATFORM-gcc
-       export CXX=$TERMUX_HOST_PLATFORM-g++
-       _SPECSFLAG=" -specs=$TERMUX_SCRIPTDIR/termux.spec"
-else
-       export AS=${TERMUX_HOST_PLATFORM}-gcc
-       export CC=$TERMUX_HOST_PLATFORM-clang
-       export CXX=$TERMUX_HOST_PLATFORM-clang++
-       # TODO: clang does not have specs file, how to ensure pie
-       # binaries gets built?
-       _SPECSFLAG=""
-fi
-export CPP=${TERMUX_HOST_PLATFORM}-cpp
-export CC_FOR_BUILD=gcc
-export LD=$TERMUX_HOST_PLATFORM-ld
-export OBJDUMP=$TERMUX_HOST_PLATFORM-objdump
-# Setup pkg-config for cross-compiling:
-export PKG_CONFIG=$TERMUX_STANDALONE_TOOLCHAIN/bin/${TERMUX_HOST_PLATFORM}-pkg-config
-export RANLIB=$TERMUX_HOST_PLATFORM-ranlib
-export READELF=$TERMUX_HOST_PLATFORM-readelf
-export STRIP=$TERMUX_HOST_PLATFORM-strip
-
-export CFLAGS="$_SPECSFLAG"
-export LDFLAGS="$_SPECSFLAG -L${TERMUX_PREFIX}/lib"
-# Android 7 started to support DT_RUNPATH (but not DT_RPATH), so we may want
-# LDFLAGS+="-Wl,-rpath=$TERMUX_PREFIX/lib -Wl,--enable-new-dtags"
-# and no longer remove DT_RUNPATH in termux-elf-cleaner.
-
-if [ "$TERMUX_ARCH" = "arm" ]; then
-       CFLAGS+=" -march=armv7-a -mfpu=neon -mfloat-abi=softfp"
-       # "first flag instructs the linker to pick libgcc.a, libgcov.a, and
-       # crt*.o, which are tailored for armv7-a"
-       # - https://developer.android.com/ndk/guides/standalone_toolchain.html
-       LDFLAGS+=" -march=armv7-a -Wl,--fix-cortex-a8"
-elif [ $TERMUX_ARCH = "i686" ]; then
-       # From $NDK/docs/CPU-ARCH-ABIS.html:
-       CFLAGS+=" -march=i686 -msse3 -mstackrealign -mfpmath=sse"
-elif [ $TERMUX_ARCH = "aarch64" ]; then
-       LDFLAGS+=" -Wl,-rpath-link,$TERMUX_PREFIX/lib"
-       LDFLAGS+=" -Wl,-rpath-link,$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib"
-elif [ $TERMUX_ARCH = "x86_64" ]; then
-       :
-else
-       echo "Error: Invalid arch '$TERMUX_ARCH' - support arches are 'arm', 'i686', 'aarch64', 'x86_64'"
-       exit 1
-fi
-
-if [ -n "$TERMUX_DEBUG" ]; then
-        CFLAGS+=" -g3 -O1 -fstack-protector --param ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
-else
-        CFLAGS+=" -Os"
-fi
-
-export CXXFLAGS="$CFLAGS"
-export CPPFLAGS="-I${TERMUX_PREFIX}/include"
-
-export ac_cv_func_getpwent=no
-export ac_cv_func_getpwnam=no
-export ac_cv_func_getpwuid=no
-
-if [ ! -d $TERMUX_STANDALONE_TOOLCHAIN ]; then
-       # Do not put toolchain in place until we are done with setup, to avoid having a half setup
-       # toolchain left in place if something goes wrong (or process is just aborted):
-       _TERMUX_TOOLCHAIN_TMPDIR=${TERMUX_STANDALONE_TOOLCHAIN}-tmp
-       rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR
-
-       _NDK_ARCHNAME=$TERMUX_ARCH
-       if [ $TERMUX_ARCH = "aarch64" ]; then
-               _NDK_ARCHNAME=arm64
-       elif [ $TERMUX_ARCH = "i686" ]; then
-               _NDK_ARCHNAME=x86
-       fi
-       $NDK/build/tools/make_standalone_toolchain.py \
-               --api $TERMUX_API_LEVEL \
-               --arch $_NDK_ARCHNAME \
-               --install-dir $_TERMUX_TOOLCHAIN_TMPDIR
-
-       if [ "arm" = $TERMUX_ARCH ]; then
-               # Fix to allow e.g. <bits/c++config.h> to be included:
-               cp $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/arm-linux-androideabi/armv7-a/bits/* \
-                       $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/bits
-       fi
-
-       cd $_TERMUX_TOOLCHAIN_TMPDIR/sysroot
-
-       for f in $TERMUX_SCRIPTDIR/ndk_patches/*.patch; do
-               sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $f | \
-                       sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
-                       patch --silent -p1;
-       done
-       # elf.h is taken from glibc since the elf.h in the NDK is lacking.
-       # sysexits.h is header-only and used by a few programs.
-       cp $TERMUX_SCRIPTDIR/ndk_patches/{elf.h,sysexits.h} $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/include
-
-       $TERMUX_ELF_CLEANER usr/lib/*.so
+}
 
-       # zlib is really version 1.2.8 in the Android platform (at least
-       # starting from Android 5), not older as the NDK headers claim.
-       for file in zconf.h zlib.h; do
-               curl -o $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/include/$file \
-                https://raw.githubusercontent.com/madler/zlib/v1.2.8/$file
-       done
-       unset file
-
-       mv $_TERMUX_TOOLCHAIN_TMPDIR $TERMUX_STANDALONE_TOOLCHAIN
-fi
-
-if [ ! -f $TERMUX_PREFIX/lib/libstdc++.so ]; then
-       # Setup libgnustl_shared.so in $PREFIX/lib and libstdc++.so as a symlink to it,
-       # so that other C++ using packages links to it instead of the default android
-       # C++ library which does not support exceptions or STL:
-       # https://developer.android.com/ndk/guides/cpp-support.html
-       # We do however want to avoid installing this, to avoid problems # where e.g.
-       # libm.so on some i686 devices links against libstdc++.so.
-       # The libgnustl_shared.so library will be packaged in the libgnustl package
-       # which is part of the base Termux installation.
-       mkdir -p $TERMUX_PREFIX/lib
-       cd $TERMUX_PREFIX/lib
-        _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/libgnustl_shared.so
-       if [ $TERMUX_ARCH = arm ]; then
-               _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/armv7-a/libgnustl_shared.so
-       elif [ $TERMUX_ARCH = x86_64 ]; then
-               _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib64/libgnustl_shared.so
-       fi
-       cp $_STL_LIBFILE .
-       ln -f -s libgnustl_shared.so libstdc++.so
-fi
-
-# Create pkg-config wrapper. We use path to host pkg-config to
-# avoid picking up a cross-compiled pkg-config later on.
-_HOST_PKGCONFIG=`which pkg-config`
-mkdir -p $TERMUX_STANDALONE_TOOLCHAIN/bin $PKG_CONFIG_LIBDIR
-cat > $PKG_CONFIG <<HERE
-#!/bin/sh
-export PKG_CONFIG_DIR=
-export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR
-exec $_HOST_PKGCONFIG "\$@"
-HERE
-chmod +x $PKG_CONFIG
-# Add a pkg-config file for the system zlib
-cat > $PKG_CONFIG_LIBDIR/zlib.pc <<HERE
-Name: zlib
-Description: zlib compression library
-Version: 1.2.8
-
-Requires:
-Libs: -lz
-HERE
-
-# Keep track of when build started so we can see what files have been created.
-# We start by sleeping so that any generated files above (such as zlib.pc) get
-# an older timestamp than the TERMUX_BUILD_TS_FILE.
-sleep 1
-TERMUX_BUILD_TS_FILE=$TERMUX_PKG_TMPDIR/timestamp_$TERMUX_PKG_NAME
-touch $TERMUX_BUILD_TS_FILE
-
-# Start by extracting the package src into $TERMUX_PKG_SRCURL:
+termux_step_handle_arguments "$@"
+termux_step_setup_variables
+termux_step_handle_buildarch
+termux_step_start_build
 termux_step_extract_package
-# Optional post processing:
+cd "$TERMUX_PKG_SRCDIR"
 termux_step_post_extract_package
-
-# Optional host build:
-if [ "x$TERMUX_PKG_HOSTBUILD" != "x" ]; then
-       cd $TERMUX_PKG_SRCDIR
-       for patch in $TERMUX_PKG_BUILDER_DIR/*.patch.beforehostbuild; do
-               test -f $patch && sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $patch | patch --silent -p1
-       done
-
-        if [ -f "$TERMUX_PKG_HOSTBUILD_DIR/TERMUX_BUILT_FOR_$TERMUX_PKG_VERSION" ]; then
-                echo "Using already built host build"
-        else
-                mkdir -p $TERMUX_PKG_HOSTBUILD_DIR     
-                cd $TERMUX_PKG_HOSTBUILD_DIR
-
-                ORIG_AR=$AR; unset AR
-                ORIG_AS=$AS; unset AS
-                ORIG_CC=$CC; unset CC
-                ORIG_CXX=$CXX; unset CXX
-                ORIG_CPP=$CPP; unset CPP
-                ORIG_CFLAGS=$CFLAGS; unset CFLAGS
-                ORIG_CPPFLAGS=$CPPFLAGS; unset CPPFLAGS
-                ORIG_CXXFLAGS=$CXXFLAGS; unset CXXFLAGS
-                ORIG_LDFLAGS=$LDFLAGS; unset LDFLAGS
-                ORIG_RANLIB=$RANLIB; unset RANLIB
-                ORIG_LD=$LD; unset LD
-                ORIG_PKG_CONFIG=$PKG_CONFIG; unset PKG_CONFIG
-                ORIG_PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR; unset PKG_CONFIG_LIBDIR
-                ORIG_STRIP=$STRIP; unset STRIP
-
-                termux_step_host_build
-                touch $TERMUX_PKG_HOSTBUILD_DIR/TERMUX_BUILT_FOR_$TERMUX_PKG_VERSION
-
-                export AR=$ORIG_AR
-                export AS=$ORIG_AS
-                export CC=$ORIG_CC
-                export CXX=$ORIG_CXX
-                export CPP=$ORIG_CPP
-                export CFLAGS=$ORIG_CFLAGS
-                export CPPFLAGS=$ORIG_CPPFLAGS
-                export CXXFLAGS=$ORIG_CXXFLAGS
-                export LDFLAGS=$ORIG_LDFLAGS
-                export RANLIB=$ORIG_RANLIB
-                export LD=$ORIG_LD
-                export PKG_CONFIG=$ORIG_PKG_CONFIG
-                export PKG_CONFIG_LIBDIR=$ORIG_PKG_CONFIG_LIBDIR
-                export STRIP=$ORIG_STRIP
-        fi
-fi
-
-if [ "$TERMUX_PKG_DEPENDS" != "${TERMUX_PKG_DEPENDS/libandroid-support/}" ]; then
-       # If using the android support library, link to it and include its headers as system headers:
-       export CPPFLAGS="$CPPFLAGS -isystem $TERMUX_PREFIX/include/libandroid-support"
-       export LDFLAGS="$LDFLAGS -landroid-support"
-fi
-
-if [ -n "$TERMUX_PKG_BUILD_IN_SRC" ]; then
-       echo "Building in src due to TERMUX_PKG_BUILD_IN_SRC being set" >> $TERMUX_PKG_BUILDDIR/BUILDING_IN_SRC.txt
-       TERMUX_PKG_BUILDDIR=$TERMUX_PKG_SRCDIR
-fi
-
-cd $TERMUX_PKG_BUILDDIR
+termux_step_handle_hostbuild
+termux_step_setup_toolchain
 termux_step_patch_package
-cd $TERMUX_PKG_BUILDDIR
+termux_step_replace_guess_scripts
+cd "$TERMUX_PKG_SRCDIR"
 termux_step_pre_configure
-cd $TERMUX_PKG_BUILDDIR
+cd "$TERMUX_PKG_BUILDDIR"
 termux_step_configure
-cd $TERMUX_PKG_BUILDDIR
+cd "$TERMUX_PKG_BUILDDIR"
 termux_step_post_configure
-cd $TERMUX_PKG_BUILDDIR
-termux_step_pre_make
-cd $TERMUX_PKG_BUILDDIR
+cd "$TERMUX_PKG_BUILDDIR"
 termux_step_make
-cd $TERMUX_PKG_BUILDDIR
+cd "$TERMUX_PKG_BUILDDIR"
 termux_step_make_install
-cd $TERMUX_PKG_BUILDDIR
+cd "$TERMUX_PKG_BUILDDIR"
 termux_step_post_make_install
-cd $TERMUX_PKG_MASSAGEDIR
+cd "$TERMUX_PKG_MASSAGEDIR"
 termux_step_extract_into_massagedir
-cd $TERMUX_PKG_MASSAGEDIR
+cd "$TERMUX_PKG_MASSAGEDIR"
 termux_step_massage
-cd $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX
+cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
 termux_step_post_massage
-
-# Create data tarball containing files to package:
-cd $TERMUX_PKG_MASSAGEDIR
-if [ -z "${TERMUX_PKG_METAPACKAGE+x}" -a "`find . -type f`" = "" ]; then
-        echo "ERROR: No files in package"
-        exit 1
-fi
-$TERMUX_TAR -cJf $TERMUX_PKG_PACKAGEDIR/data.tar.xz .
-
-# Get install size. This will be written as the "Installed-Size" deb field so is measured in 1024-byte blocks:
-TERMUX_PKG_INSTALLSIZE=`du -sk . | cut -f 1`
-
-# Create deb package:
-# NOTE: From here on TERMUX_ARCH is set to "all" if TERMUX_PKG_PLATFORM_INDEPENDENT is set by the package
-test -n "$TERMUX_PKG_PLATFORM_INDEPENDENT" && TERMUX_ARCH=all
-
-cd $TERMUX_PKG_MASSAGEDIR
-
-mkdir -p DEBIAN
-cat > DEBIAN/control <<HERE
-Package: $TERMUX_PKG_NAME
-Architecture: ${TERMUX_ARCH}
-Installed-Size: ${TERMUX_PKG_INSTALLSIZE}
-Maintainer: $TERMUX_PKG_MAINTAINER
-Version: $TERMUX_PKG_FULLVERSION
-Description: $TERMUX_PKG_DESCRIPTION
-Homepage: $TERMUX_PKG_HOMEPAGE
-HERE
-test ! -z "$TERMUX_PKG_DEPENDS" && echo "Depends: $TERMUX_PKG_DEPENDS" >> DEBIAN/control
-test ! -z "$TERMUX_PKG_ESSENTIAL" && echo "Essential: yes" >> DEBIAN/control
-test ! -z "$TERMUX_PKG_CONFLICTS" && echo "Conflicts: $TERMUX_PKG_CONFLICTS" >> DEBIAN/control
-test ! -z "$TERMUX_PKG_REPLACES" && echo "Replaces: $TERMUX_PKG_REPLACES" >> DEBIAN/control
-
-# Create DEBIAN/conffiles (see https://www.debian.org/doc/debian-policy/ap-pkg-conffiles.html):
-for f in $TERMUX_PKG_CONFFILES; do echo $TERMUX_PREFIX/$f >> DEBIAN/conffiles; done
-# Allow packages to create arbitrary control files:
-cd DEBIAN
-termux_step_create_debscripts
-
-# Create control.tar.xz
-$TERMUX_TAR -cJf $TERMUX_PKG_PACKAGEDIR/control.tar.xz .
-# In the .deb ar file there should be a file "debian-binary" with "2.0" as the content:
-TERMUX_PKG_DEBFILE=$TERMUX_DEBDIR/${TERMUX_PKG_NAME}_${TERMUX_PKG_FULLVERSION}_${TERMUX_ARCH}.deb
-# Create the actual .deb file:
-ar cr "$TERMUX_PKG_DEBFILE" \
-                   "$TERMUX_COMMON_CACHEDIR/debian-binary" \
-                   "$TERMUX_PKG_PACKAGEDIR/control.tar.xz" \
-                   "$TERMUX_PKG_PACKAGEDIR/data.tar.xz"
-
-if [ "$TERMUX_PROCESS_DEB" != "" ]; then
-       $TERMUX_PROCESS_DEB "$TERMUX_PKG_DEBFILE"
-fi
-
-echo "termux - build of '$1' done"
-test -t 1 && printf "\033]0;%s - DONE\007" "$1"
-
-mkdir -p /data/data/.built-packages
-echo "$TERMUX_PKG_FULLVERSION" > "/data/data/.built-packages/$TERMUX_PKG_NAME"
-exit 0
+termux_step_create_datatar
+termux_step_create_debfile
+termux_step_finish_build