Cannot run example codes in OpenGL Programming Guide on OS X with Xcode

I’m reading OpenGL Programming Guide: The Official Guide to Learning OpenGL. But I come across problems when running the first example.I’ve already add the path where vgl.h and LoadShaders.h are located to Header Search Paths. (I will post these two files at the end of the post.) But a error shows up:[ATTACH=CONFIG]871[/ATTACH]what’s wrong with my settings?