autoconf/configure problems

I'm still trying to track down the bug in the port for libmng. I've tried to contact the maintainer but have heard nothing. In the build process it appears that autoconf generates a configure script, but executing 'configure' does nothing. It does not go through the normal checks and it does not create a Makefile it simply prints nothing and exits. Without the Makefile the installation can't proceed. config.log shows exit 0. My ports installation is up to date and synced. I'm on a PBook G4 with 10.4.10 Dave