尝试将 Lua 头文件导入 C++ 项目时，出现链接器错误？

我正在尝试编写一些可以在 Lua 中运行的 C++ 函数。然而，当我尝试导入头文件时，我会遇到以下错误：

Undefined symbols for architecture x86_64:
  "_luaL_loadfilex", referenced from:
      _main in main.o
  "_luaL_newstate", referenced from:
      _main in main.o
  "_luaL_openlibs", referenced from:
      _main in main.o
  "_lua_close", referenced from:
      _main in main.o
  "_lua_pcallk", referenced from:
      _main in main.o
  "_lua_pushcclosure", referenced from:
      _main in main.o
  "_lua_setglobal", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我已经将文件路径添加到 Build Settings 中的 Header Search Paths 选项中。

这是导入代码：

extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}

我做错了什么？