$ autoconf
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
configure.in:19: error: possibly undefined macro: AM_PROG_LIBTOOL
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.in:413: error: possibly undefined macro: AM_PATH_GLIB
configure.in:415: error: possibly undefined macro: AM_PATH_GLIB_2_0