Please see the Android source page for building instructions.
To initialize your local repository using my trees, use the following command:
repo init -u https://github.com/AOKP/platform_manifest.git -b ics
Then to sync up:
repo sync
After the sync is finished, please read the instructions from the Android site on how to build.
Once you've read that, you can build with
mka
This will compile everything and use the correct "-j#" flag.
You can also build a flashable zip with
mka otapackage
Huge shout out to @peteralfonzo for his wonderfully clean vendor tree to use as a base. This makes this infinitely more oragnized and easier to work with. Thank him!