AC_PROG_YACC
AC_PROG_LEX
+AC_DEFUN([AC_PROG_BISON], [AC_CHECK_PROGS(BISON, bison, bison)])
+
AM_PATH_GLIB_2_0(2.4.0, ,AC_MSG_ERROR([glib is required in order to compile BabelTrace - download it from ftp://ftp.gtk.org/pub/gtk]) , gmodule)
# Checks for typedefs, structures, and compiler characteristics.