echo " autoheader: $(autoheader --version | head -1)"
echo " automake: $(automake --version | head -1)"
-chmod +x version.sh
rm -rf autom4te.cache
-aclocal $AL_OPTS
-autoconf $AC_OPTS
-autoheader $AH_OPTS
+aclocal -I m4 $AL_OPTS &&
+autoconf -I m4 $AC_OPTS &&
+autoheader -I m4 $AH_OPTS ||
+exit 1
# it's better to use helper files from automake installation than
# maintain copies in git tree