-for using the LuaJIT project. Or:
-
- $ make LUA_IMPLEMENTATION=VANILLA
-
-for the mainline Lua project. If you specify neither implementation, it will
-be auto-detected, preferring LuaJIT if both are present.
+If this is not specified, the Lua implementation will be auto-detected,
+preferring LuaJIT if many are present. Acceptable values are generally "lua",
+"luajit", "lua5.1", and "lua5.2".