Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yes, it appears that you have not set the path for the gsl directory.

How do you set the path in XCode? Where is the located exactly? And how to set a path to it? Could you provide a command line example?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.