+PKG_CHECK_MODULES([GMODULE], [gmodule-2.0])
+AC_SUBST(GMODULE_CFLAGS)
+AC_SUBST(GMODULE_LIBS)
+
+AC_PATH_PROG([FLEX], [flex])
+test "$FLEX" || AC_MSG_ERROR([flex not found])
+
+AC_PATH_PROG([BISON], [bison])
+test "BISON" || AC_MSG_ERROR([bison not found])
+