--- /dev/null
+# -*- autoconf -*-
+
+AT_BANNER([Compatibility with other tools.])
+
+## -------------------- ##
+## Autoconf & Libtool. ##
+## -------------------- ##
+
+AT_SETUP([[Autoconf & Libtool]])
+
+# Skip this test if there is no libtoolize.
+AT_CHECK([libtoolize --version || exit 77], 0, ignore, ignore)
+
+# Using a configure.in, have libtoolize confess where libtool.m4 is.
+AT_DATA([configure.in],
+[[AC_INIT
+AC_CONFIG_AUX_DIR(.)
+AC_PROG_LIBTOOL
+]])
+AT_CHECK([libtoolize | sed -n ["s,^.*\`\(/[^']*\)'.*,\1,p"] >at-path],
+ 0, [], ignore)
+
+# Build the concatenation of libtool.m4 and configure.in.
+cp `cat at-path` configure.in
+cat >>configure.in <<_EOF
+AC_INIT
+AC_CONFIG_AUX_DIR(.)
+AC_PROG_LIBTOOL
+_EOF
+
+AT_CHECK_AUTOCONF
+
+touch install-sh
+AT_CHECK_CONFIGURE
+
+AT_CLEANUP(install-sh ltconfig libtool at-path ltmain.sh config.guess config.sub)
+# -*- autoconf -*-
+
+AT_BANNER([Compatility with other tools.])
+
+## -------------------- ##
+## Autoconf & Libtool. ##
+## -------------------- ##
+
+AT_SETUP([[Autoconf & Libtool]])
+
+# Skip this test if there is no libtoolize.
+AT_CHECK([libtoolize --version || exit 77], 0, ignore, ignore)
+
+# Using a configure.in, have libtoolize confess where libtool.m4 is.
+AT_DATA([configure.in],
+[[AC_INIT
+AC_CONFIG_AUX_DIR(.)
+AC_PROG_LIBTOOL
+]])
+AT_CHECK([libtoolize >libtoolize.log 2>&1], 0)
+
+# Build the concatenation of libtool.m4 and configure.in.
+cp `sed -n [s,^.*\`\(/[^\']*\)\'.*/\1/p] libtoolize.log` configure.in
+cat >>configure.in <<_EOF
+AC_INIT
+AC_CONFIG_AUX_DIR(.)
+AC_PROG_LIBTOOL
+_EOF
+
+AT_CHECK_AUTOCONF
+AT_CHECK_CONFIGURE
+
+AT_CLEANUP(libtoolize.log)