[Motorola Atrix HD] ssuds:
I've had some people PM me for guidance building CM12 from source from the Atrix HD. There are currently no device specific guides, so this will help those of you who want to get their hands dirty with development but don't have a place to start.

Please note that I am writing this from memory as I don't feel like wiping my build environment and setting it up again for the purpose of this tutorial. That said, this *should* be accurate, but if you hit any snags comment and we can try and sort them out.

CREDITS:

This is adapted from http://wiki.cyanogenmod.org/w/Build_for_mb886 and http://xdaforums.com/nexus-4/general/guide-cm11-how-to-build-cyanogenmod-11-t2515305 (Big thank you to [MENTION=4732829]Raum1807[/MENTION] for the excellent guide, I'm merely modifying it to work for the MB886).

Overview

I. Preparation

II. Installation of the required packages

III. Installing Java

IV. The sources

V. Building the ROM

VI. Rebuilding with newest sources

I. Preparation

Things you need for building:

A computer

An internet connection

An open mind

Time

Patience

First of all, you need a running up-to-date Ubuntu/Linux system. I used Ubuntu 14.04 LTS 64-bit from within a VirtualBox VM.

Use the terminal to make the steps. A terminal window can be opened by pressing Ctrl+Alt+T. Every single command for the terminal is marked with a $ sign. Just paste every command (without the $ sign) to your terminal window and there shouldn't be any problem.

IMPORTANT: INSTALL EVERYTHING AS A NORMAL USER. DON'T INSTALL AS ROOT!

II. Installation of the required packages (Ubuntu 14.04 LTS 64-bit)

Install packages:

$ sudo apt-get install bison build-essential curl flex \
g++-multilib gcc-multilib git-core gnupg gperf \
lib32ncurses5-dev lib32readline-gplv2-dev lib32z1-dev \
libesd0-dev libncurses5-dev libsdl1.2-dev \
libwxgtk2.8-dev libxml2 libxml2-utils lzop \
openjdk-6-jdk openjdk-6-jre pngcrush schedtool \
squashfs-tools xsltproc zip zlib1g-dev

III. Installing Java

You need a version 6 Java Development Kit for building CM12.0. Usually, the SUN JDK 6 is recommended. But there is another way: you can use the OpenJDK 6. When you installed the required packages as described above, you will just need to configure your Java installation.

Check your Java version:

$ java -version

Verify the symlinks. Javac, Java, Javaws, Javadoc, Javah, Javap and Jar should all point to the right Java location and version:

$ ls -la /etc/alternatives/java* && ls -la /etc/alternatives/jar

If they are pointing to the wrong versions you have to change that to OpenJDK6.

Select the default Java version for your system:

$ sudo update-alternatives --config javac
$ sudo update-alternatives --config java
$ sudo update-alternatives --config javaws
$ sudo update-alternatives --config javadoc
$ sudo update-alternatives --config javah
$ sudo update-alternatives --config javap
$ sudo update-alternatives --config jar

All done.

IV. The sources

Install repo:

Repo is a tool that makes it quite easy to download and maintain the sources of Cyanogenmod.

$ mkdir ~/bin
$ PATH=~/bin:$PATH
$ cd ~/bin
$ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
$ chmod a+x ~/bin/repo

Create the working directory:

$ mkdir ~/cm12
$ cd ~/cm12

Initialize Repo:

$ repo init -u git://github.com/CyanogenMod/android.git -b cm-12.0

and enter your credentials.

Download the sources:

$ repo sync

Wait until it's finished - takes some time to download the many GB of source code!

If the process hangs use Ctrl+C to break out of it and resume the download with another

$ repo sync

If you are running into a lot of syncing errors the reason might be that the 'repo sync' command is establishing four threads automatically. This might be too much. So try to change the command to run with one thread only by using

$ repo sync -j1

Initialize the environment

$ . build/envsetup.sh

Obtain the proprietary files:

First get missing repositories for the Atrix HD by running

$ breakfast mb886

Then create a file with the name local_manifest.xml in the local_manifests directory. To see this directory, you have to press Ctrl-H in your file manager. Use this code

$ gedit ~/cm12/.repo/local_manifests/local_manifest.xml

Paste the following lines to the editor

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
<project name="TheMuppets/proprietary_vendor_motorola.git" path="vendor/motorola" remote="github" revision="cm-12.0"/>
</manifest>

Save the file.

Run

$ repo sync

again to get the files needed.

Download the necessary prebuilts from cyanogenmod by running

$ cd ~/cm12/vendor/cm
$ . get-prebuilts
$ croot

And you're done!

V. Building the ROM

Now build it:

$ brunch mb886

And the building process starts. Now have patience. Building takes around half an hour on fast systems and a lot more on older,slower machines and VMs.

When everything worked as it should you will find your new ROM-image in ~/cm12/out/target/product/mb886

It is called cm-12-DATE-UNOFFICIAL-mb886-zip. You can flash it via CWM/PhilZ/Cyanogen Recovery as usual.

VI. Rebuilding with newest sources

Whenever you like to update your sources and build a new version you have to run these four simple commands:

$ cd ~/cm12
$ repo sync
$ . build/envsetup.sh
$ brunch mb886

Compiling takes less time than it took for creating the ROM the first time because it's only building new parts while reusing old parts that haven't changed. Occasionally you might want to wipe your output directory and build completely anew. To do this:

$ cd ~/cm12
$ repo sync
$ make clean
$ . build/envsetup.sh
$ brunch mb886

Good luck!