I guess it's because your shell can't find the ar command. According to Apple's dev pages it should have been part of Xcode. Might wanna check your installation again. Dunno too much about OS X, but it's a Unix OS. Try this command from the terminal:
See if it prints out a path to the executable. If it does, then that means it's at least installed on your computer. It could just be that it's not installed where your shell expects it.
Code:
which arSee if it prints out a path to the executable. If it does, then that means it's at least installed on your computer. It could just be that it's not installed where your shell expects it.
