GLSL project in XCode4

To create an shader based OpenGL command line app using XCode4 follow these steps (at least they worked for me):

1. Create a "Command Line Tool" application 
2. Add the "OpenGL" and "GLUT" frameworks (click on the project -> target, "Build Phases" tab and add them in the "Link Binary With Libraries" panel)
3. Write the main to setup GLUT and load/use shaders
4. Write your shaders
5. In the Project Setting -> Target -> Build Phases, drag the shader files onto the  "Compile Sources" panel
6. In the Project Setting -> Target -> Build Phases, add a new and "Copy Files" phase and drag the shaders onto it. Make sure to set the "Destination" option to "Executables"

Hope this helps!