Old guide

Old guide which might be useful if someone is building with an older version:

All of TWRP 2.x source is public. You can compile it on your own. This guide isn't going to be a step-by-step, word-for-word type of guide. If you're not familiar with basic Linux commands and/or building in AOSP then you probably won't be able to do this.

You can currently use Omni 4.3, Omni 4.4, Omni 5.0, CM10.0, CM10.1, CM10.2, and CM11.0 source code. Omni 4.4 or 5.0 is recommended. Lately CM keeps making changes that make building TWRP more difficult and they make no effort to work with TWRP. You can build in CM but you may run into a few minor issues. If you don't know how to fix make file issues, then you should choose to use Omni instead. (If for some reason you need to compile in an older tree like CM9 or CM7, you will have to use the android-4.4 branch which we will not continue to update.)

If you are using CM, you'll need to replace CM/bootable/recovery with this: https://github.com/omnirom/android_bootable_recovery Select the newest branch available. This step is not necessary with Omni because Omni already includes TWRP source by default. If you are using CM 12.0 then you will probably want to cherry pick this patch into external/sepolicy: http://review.cyanogenmod.org/#/c/89474/

If you are in a bind and want to try working with a smaller tree either due to disk space or download size, you can try using this manifest. It should work in most cases but there may be some situations where you will need more repos in your tree than this manifest provides: https://github.com/marduk191/recovery_manifest

NEXT: Before you compile