Building LineageOS 20.0

Building LineageOS 20.0 from source requires some familiarity with Linux and the command line. Follow these steps to get started:

Step 1: Install Google's Repo tool

Before you begin, make sure you have the necessary tools:

sudo apt-get install bc bison build-essential ccache curl flex g++-multilib gcc-multilib git gnupg gperf imagemagick lib32ncurses5-dev lib32readline-dev lib32z1-dev liblz4-tool libncurses5 libncurses5-dev libsdl1.2-dev libssl-dev libxml2 libxml2-utils lzop pngcrush rsync schedtool squashfs-tools xsltproc zip zlib1g-dev

Now, install Google's repo tool:

mkdir -p ~/bin
echo 'PATH=~/bin:$PATH' >> ~/.bashrc
source ~/.bashrc
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
chmod a+x ~/bin/repo

Step 2: Download LineageOS 20.0 source code

Create a directory for LineageOS source code and navigate to it

mkdir -p ~/android/lineage
cd ~/android/lineage

Initialize repo tool with LineageOS 20.1 source

repo init -u git://github.com/mt8163/android.git -b lineage-20.0
git clone https://github.com/mt8163/local_manifests -b lineage-20.0 .repo/local_manifests
repo sync

Step 3: Build LineageOS

Make sure you have adb and fastboot installed and in your PATH. If not, follow the instructions here: ADB and Fastboot installation guide

source build/envsetup.sh
brunch lineage_karnak-userdebug

Improving build times with ccache

To speed up future builds, you can enable ccache support. Run the following command before each build:

export USE_CCACHE=1

To persistently enable ccache and set the maximum disk space it can use, add the following lines to your ~/.bashrc file:

export USE_CCACHE=1
ccache -M 50G # Set cache size to 50GB (adjust as needed)

Using ccache can significantly reduce build times, so consider allocating enough disk space for caching.

• Note: The above instructions are meant for LineageOS 20.0. Make sure to use the appropriate branch and repository URLs for other versions.

For more details and troubleshooting, refer to the official LineageOS documentation: LineageOS Wiki