-diff -u -r ../zeromq-4.2.2/configure.ac ./configure.ac
---- ../zeromq-4.2.2/configure.ac 2017-02-18 19:05:37.000000000 +0100
-+++ ./configure.ac 2017-03-23 10:31:34.501893021 +0100
-@@ -653,17 +653,6 @@
- AC_SUBST(pkg_config_defines, "")
- fi
-
--PKG_CHECK_MODULES(LIBUNWIND, [libunwind],
-- [
-- AC_DEFINE(HAVE_LIBUNWIND, 1, [The libunwind library is to be used])
-- AC_SUBST([LIBUNWIND_CFLAGS])
-- AC_SUBST([LIBUNWIND_LIBS])
-- AC_CHECK_LIB([dl], [dladdr])
-- ],
-- [
-- AC_MSG_WARN([Cannot find libunwind])
-- ])
--
- # Subst LIBZMQ_EXTRA_CFLAGS & CXXFLAGS & LDFLAGS
- AC_SUBST(LIBZMQ_EXTRA_CFLAGS)
- AC_SUBST(LIBZMQ_EXTRA_CXXFLAGS)