Use AC_PROG_LIBTOOL
diff --git a/libtool b/libtool
index d769fd7..0331b3e 100755
--- a/libtool
+++ b/libtool
@@ -44,7 +44,7 @@
 macro_revision=1.3337
 
 # Whether or not to build shared libraries.
-build_libtool_libs=no
+build_libtool_libs=yes
 
 # Whether or not to build static libraries.
 build_old_libs=yes