pabs@chianamo:~/devel/misc/synfig/etl/config$ autoreconf
configure.ac:37: error: possibly undefined macro: AC_ARG_WARNINGS
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:38: error: possibly undefined macro: AC_ARG_DEBUG
configure.ac:39: error: possibly undefined macro: AC_ARG_OPTIMIZATION
configure.ac:40: error: possibly undefined macro: AC_ARG_PROFILING
configure.ac:42: error: possibly undefined macro: AC_WIN32_QUIRKS
autoreconf: /usr/bin/autoconf failed with exit status: 1