You can clone with
HTTPS or Subversion.
For OS X release build, the step adding framework to Copy Files phrase is needed when installing RestKit in Xcode 4.x.
If this step does not do it, could not launch the application that its archived and distributed.
There is the same situation for this.
This step would be located after the linkage framework step on the install documentation.
Add framework copy files images. refs #757
Added to the docs on https://github.com/RestKit/RestKit/wiki/Installing-RestKit-v0.20.x-as-a-Git-Submodule