On Thu, 2010-01-28 at 18:52 -0500, Robert Henney wrote: > the build gets much farther now, but does stop at this point. I'm not > familiar with autoconf, but I installed it because the git mplayer doesn't > seem to want to build without it. The MPlayer git repo itself does not use autoconf, but the MPlayer-build wrapper compiles an up-to-date version of libass to link MPlayer with, and libass does need autoconf. svn had duplicated build functionality for libass that didn't use its normal build system; that didn't require autoconf but was ugly and much harder to update. > configure.ac:7: error: possibly undefined macro: AC_PROG_LIBTOOL My guess is that you're missing the libtool package and need to install that too.