Lua-cURLv3-skip-luaL_setfuncs-on-luajit.patch

diff --git a/src/l52util.c b/src/l52util.c
index 6373687..4c1d3ee 100644
--- a/src/l52util.c
+++ b/src/l52util.c
@@ -14,7 +14,16 @@
 #include <string.h> /* for memset */
 #include <assert.h>
 
-#if LUA_VERSION_NUM >= 502 
+/* LuaJIT (LUA_VERSION_NUM == 501) ships luaL_setfuncs as an extension; pull in
+   luajit.h so LUAJIT_VERSION is visible and the < 502 definition below can be
+   skipped, avoiding a duplicate-symbol link error against the LuaJIT library. */
+#if defined(__has_include)
+#  if __has_include(<luajit.h>)
+#    include <luajit.h>
+#  endif
+#endif
+
+#if LUA_VERSION_NUM >= 502
 
 int luaL_typerror (lua_State *L, int narg, const char *tname) {
   const char *msg = lua_pushfstring(L, "%s expected, got %s", tname,
@@ -33,6 +42,7 @@ void luaL_register (lua_State *L, const char *libname, const luaL_Reg *l){
 
 #else 
 
+#if !defined(LUAJIT_VERSION) /* LuaJIT already provides luaL_setfuncs */
 void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup){
   luaL_checkstack(L, nup, "too many upvalues");
   for (; l->name != NULL; l++) {  /* fill the table with given functions */
@@ -44,6 +54,7 @@ void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup){
   }
   lua_pop(L, nup);  /* remove upvalues */
 }
+#endif
 
 void lua_rawgetp(lua_State *L, int index, const void *p){
   index = lua_absindex(L, index);