-TERMUX_PKG_VERSION=16.4.1
-TERMUX_PKG_BUILD_REVISION=1
-TERMUX_PKG_SRCURL=http://software-lab.de/picoLisp.tgz
+_PICOLISP_YEAR=16
+_PICOLISP_MONTH=9
+_PICOLISP_DAY=6
+TERMUX_PKG_VERSION=${_PICOLISP_YEAR}.${_PICOLISP_MONTH}.${_PICOLISP_DAY}
+# We use our bintray mirror since old version snapshots are not kept on main site.
+# TERMUX_PKG_SRCURL=http://software-lab.de/picoLisp.tgz
+TERMUX_PKG_SRCURL=https://dl.bintray.com/termux/upstream/picolisp_${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=f8559112db9b8984e961c257fb7327705434c9f3c4e3f5bc745d4d726ef7094a