1 files changed, 13 insertions, 0 deletions

diff --git a/c-api/compat-5.3.h b/c-api/compat-5.3.h
index 3d20d21..6c76930 100644
--- a/c-api/compat-5.3.h
+++ b/c-api/compat-5.3.h
@@ -88,6 +88,19 @@ extern "C" {
 #  define LUA_OPLE 2
 #endif
 
+/* LuaJIT/Lua 5.1 does not have the updated 
+ * error codes for thread status/function returns (but some patched versions do)
+ * define it only if it's not found
+ */
+#if !defined(LUA_ERRGCMM)
+/* Use + 2 because in some versions of Lua (Lua 5.1) 
+ * LUA_ERRFILE is defined as (LUA_ERRERR+1)
+ * so we need to avoid it (LuaJIT might have something at this
+ * integer value too)
+ */
+#  define LUA_ERRGCMM (LUA_ERRERR + 2)
+#endif /* LUA_ERRGCMM define */
+
 typedef size_t lua_Unsigned;
 
 typedef struct luaL_Buffer_53 {