--- a/util-src/pposix.c	Fri Jan 06 13:14:17 2017 +0100
+++ b/util-src/pposix.c	Sun Jan 08 14:21:08 2017 +0100
@@ -779,6 +779,9 @@
 /* Register functions */
 
 int luaopen_util_pposix(lua_State* L) {
+#if (LUA_VERSION_NUM > 501)
+	luaL_checkversion(L);
+#endif
 	luaL_Reg exports[] = {
 		{ "abort", lc_abort },