This short guide assumes you're on Ubuntu 11.04
Getting the (right) source
First, we need to create directories for the build:
$ mkdir -p ~/bin $ mkdir -p ~/android/system
Now we'll need repo. Let's download it and make it executable:
$ curl http://android.git.kernel.org/repo > ~/bin/repo $ chmod a+x ~/bin/repo
Log out and back in so the changes take effect.
Now initialized the repository and pull the source (with my repos attached):
$ cd ~/android/system/ $ repo init -u git://github.com/playfulgod/android.git -b gingerbread $ repo sync -j16
Depending on your connection, this might take awhile.
Extract necessary binaries and proprietary files
We will need to reuse some proprietary files. The best ROM to obtain these from is a build of CM7-Ascend (05012011 or later). The Tapout ROM can also be used:
$ cd $ cd ~/android/system/device/lge/thunderc $ ./extract-files.sh
Once thats done you can start compiling.
Follow the aosp instructions on setting up the build environment. - http://source.android.com/source/download.html
When the environment is setup, we need to grab a copy of Koush's ROM Manager. This is necessary to build CM7.
$ cd $ ~/android/system/vendor/cyanogen/get-rommanager
Now, we build:
$ cd ~/android/system $ . build/envsetup.sh && brunch thunderc_LW690
If for some reason it fails, make sure to do the following between builds:
$ make clean clobber
If the build was successful, you can now take the update zip found in out/target/product/ascend/ and flash using a custom recovery. Make sure to grab the latest Gapps to complete the experience.