Hi, everyone, After upgrading my existing build environment to Autoconf 2.54 (it took a lot of work to get it here from 2.13, and upgrading my not be possible), I'm getting the following error messages, and I don't know where to start. sdrummon@computer{Linux-2.4} 1047> autoconf configure:2675: error: possibly undefined macro: AC_FULLPATH If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. I've perused the on-line documentation and done some web searching, but cannot find out where to start with this AC_FULLPATH message. Can anyone offer a recommendation? Thanks, Scott