+ACLOCAL="aclocal -I ${PWD}/m4"
+AUTOHEADER="autoheader"
+AUTOMAKE="automake --add-missing --copy --foreign"
+AUTOCONF="autoconf"
+ACINCLUDE_FILES="lyxinclude.m4 libtool.m4 pkg.m4 qt.m4 qt4.m4 spell.m4"
+
+# Discover what version of automake we are using.
+automake_version=`$AUTOMAKE --version 2>/dev/null | head -n 1`
+
+test "$automake_version" != "" && {
+ echo "Using $automake_version"
+} || {
+ echo "LyX requires automake >= 1.9"
+ exit 1
+}
+
+case $automake_version in
+ *' '1.9*|*' '1.10*)
+ ;;
+ *)
+
+ echo "This automake version is not supported by LyX."
+ echo "LyX only supports automake 1.9 and 1.10."
+ exit 1
+ ;;
+esac
+
+# Discover what version of autoconf we are using.
+autoversion=`$AUTOCONF --version 2>/dev/null | head -n 1`
+
+test "$autoversion" != "" && {
+ echo "Using $autoversion"
+} || {
+ echo "LyX requires autoconf >= 2.52"
+ exit 1
+}
+
+case $autoversion in
+ *' '2.5[2-9]|*' '2.60[ab]|*' '2.6[0-1])
+ EXTRA_ACINCLUDE_FILES="lyxinclude25x.m4"
+ ;;
+ *)
+ echo "This autoconf version is not supported by LyX."
+ echo "LyX only supports autoconf 2.52-2.61."
+ exit 1
+ ;;
+esac
+
+echo -n "Locating GNU m4... "
+GNUM4=
+for prog in $M4 gm4 gnum4 m4; do
+ # continue if $prog generates error (e.g. does not exist)
+ ( $prog --version ) < /dev/null > /dev/null 2>&1
+ if test $? -ne 0 ; then continue; fi
+
+ # /dev/null input prevents a hang of the script for some m4 compilers (e.g. on FreeBSD)
+ case `$prog --version < /dev/null 2>&1` in
+ *GNU*) GNUM4=$prog
+ break ;;
+ esac
+done
+if test x$GNUM4 = x ; then
+ echo "not found."
+ exit 1
+else
+ echo `which $GNUM4`
+fi
+
+# Delete old cache directories.
+# automake will stop if their contents was created by an earlier version.
+rm -rf autom4te.cache
+
+# Generate acinclude.m4
+echo -n "Generate acinclude.m4... "
+rm -f acinclude.m4
+(cd config ; cat ${ACINCLUDE_FILES} ${EXTRA_ACINCLUDE_FILES} >../acinclude.m4)
+echo "done."