Please read through each sentence before you act on it or anything before it. Since you're not installing this on a standard install, you'll need to be extra dilligent about installing this!
- Determine what version of OSx you're running. To do this click on the Apple Button in the top left corner of the menu bar and press "About this Mac". A dialog box should pop up and tell you, you are using OSX 10.x.y. Remember this version.
- Download and run the GCC compiler from here. Go under 'downloads' to find it. Make sure the version of the installer you grab matches the version of OSx you saw in the previous step.
- In the standard install guide skip ahead to the Homebrew section and follow that step.
- Install libksba by running the following command:
brew install libksba
- Install git by runing the following command:
brew install git