Fix a macro redefinition when compiling against Lua 5.2 with compatibility options enabled

1 files changed, 2 insertions, 0 deletions

diff --git a/src/tools.h b/src/tools.h
index b48114c..e984ec2 100644
--- a/src/tools.h
+++ b/src/tools.h
@@ -35,7 +35,9 @@ void luaL_requiref (lua_State* L, const char* modname, lua_CFunction openf, int
 #ifndef lua_equal // already defined when compatibility is active in luaconf.h
 #define lua_equal( L, a, b) lua_compare( L, a, b, LUA_OPEQ)
 #endif // lua_equal
+#ifndef lua_lessthan // already defined when compatibility is active in luaconf.h
 #define lua_lessthan( L, a, b) lua_compare( L, a, b, LUA_OPLT)
+#endif // lua_lessthan
 #define luaG_registerlibfuncs( L, _funcs) luaL_setfuncs( L, _funcs, 0)
 #endif // LUA_VERSION_NUM == 502