Thanks for the quick response, Alfred M. Szmidt wrote: > Please see `(autoconf) Subdirectories' in the manual. That was where I started: I already use AC_CONFIG_SUBDIRS (zlib compression boost_ext) AC_OUTPUT([Makefile]) in the top level configure.ac and SUBDIRS= zlib compression boost_ext in Makefile.am This all seems to work for the existing entries but when I add zlib, zlib is not treated as the others. thanks dan _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf