+#if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
+
+// Compatibility shims for LuaJIT 2.0 (LuaJIT 2.1 implements the entire Lua 5.2 API).
+// Adapted from https://github.com/keplerproject/lua-compat-5.2/blob/master/c-api/compat-5.2.c
+// and licensed as follows:
+//
+// The MIT License (MIT)
+//
+// Copyright (c) 2013 Hisham Muhammad
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+/*
+** Adapted from Lua 5.2.0
+*/
+void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup) {
+ luaL_checkstack(L, nup+1, "too many upvalues");
+ for (; l->name != NULL; l++) { /* fill the table with given functions */
+ int i;
+ lua_pushstring(L, l->name);
+ for (i = 0; i < nup; i++) /* copy upvalues to the top */
+ lua_pushvalue(L, -(nup + 1));
+ lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
+ lua_settable(L, -(nup + 3)); /* table must be below the upvalues, the name and the closure */
+ }
+ lua_pop(L, nup); /* remove upvalues */
+}
+
+void *luaL_testudata(lua_State *L, int i, const char *tname) {
+ void *p = lua_touserdata(L, i);
+ luaL_checkstack(L, 2, "not enough stack slots");
+ if (p == NULL || !lua_getmetatable(L, i))
+ return NULL;
+ else {
+ int res = 0;
+ luaL_getmetatable(L, tname);
+ res = lua_rawequal(L, -1, -2);
+ lua_pop(L, 2);
+ if (!res)
+ p = NULL;
+ }
+ return p;
+}
+
+#endif
+