luaL_newlib is the way

src/api_draw.c

@@ -25,8 +25,7 @@ bool loadapi_draw(lua_State *lua) {
     { "circle", api_draw_circle },
     { "ring", api_draw_ring },
   };
-  lua_newtable(lua);
-  luaL_setfuncs(lua, api_draw, 0);
+  luaL_newlib(lua, api_draw);
   lua_setglobal(lua, "Draw");
   return true;
 }