I am trying to help someone build the liblouisutdml on a mac and I can't get past running autogen. I keep getting the following message. Greg, I think you've run into this problem. How exactly did you resolve it? Running autoreconf... configure.ac:43: warning: macro 'AM_PROG_LIBTOOL' not found in library configure.ac:42: error: possibly undefined macro: AC_LIBTOOL_WIN32_DLL If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. configure.ac:43: error: possibly undefined macro: AM_PROG_LIBTOOL autoreconf: /usr/local/Cellar/autoconf/2.69/bin/autoconf failed with exit status: 1