To build LineageOS for Samsung devices powered by the SM8350 SoC, such as the Samsung Galaxy S21 FE (r9q), follow the steps below.

• Operating System: A 64-bit Linux distribution (e.g., Ubuntu 20.04 LTS) is recommended.
• Hardware: At least 16 GB of RAM and 200 GB of free storage.
• Tools: Ensure adb and fastboot are installed and configured on your system.

1. Install Required Packages:

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

2. Install Repo Tool:

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

3. Configure Git:

   git config --global user.name "Your Name"
   git config --global user.email "[email protected]"

1. Initialize the Repo:

   mkdir -p ~/android/lineage
   cd ~/android/lineage
   repo init -u https://github.com/LineageOS/android.git -b lineage-22.0

2. Create a Roomservice Manifest:

   Ensure the .repo/local_manifests/ directory exists:

   mkdir -p .repo/local_manifests

   Method 1:

   Create a file named roomservice.xml in the .repo/local_manifests/ directory with the following content:

   <?xml version="1.0" encoding="UTF-8"?>
   <manifest>
       <!-- Samsung SM8350 Common Trees -->
       <project name="samsung-sm8350/android_device_samsung_sm8350-common" path="device/samsung/sm8350-common" remote="github" revision="lineage-22" />
       <project name="samsung-sm8350/android_kernel_samsung_sm8350" path="kernel/samsung/sm8350" remote="github" revision="lineage-22" />
       <!-- Dependencies -->
       <project name="samsung-sm8350/android_device_qcom_common" path="device/qcom/common" remote="github" revision="lineage-22" />
       <project name="samsung-sm8350/android_hardware_samsung" path="hardware/samsung" remote="github" revision="lineage-22.0" />
       <!-- Vendor Tree -->
       <project name="samsung-sm8350/proprietary_vendor_samsung" path="vendor/samsung" remote="github" revision="lineage-22" />
       <!-- Samsung Galaxy S21 FE (r9q) [SM-G990B] -->
       <project name="samsung-sm8350/android_device_samsung_r9q" path="device/samsung/r9q" remote="github" revision="lineage-22" />
   </manifest>

   Method 2:

   Fetch Roomservice Manifest:

   curl -o .repo/local_manifests/roomservice.xml https://raw.githubusercontent.com/samsung-sm8350/.github/refs/heads/main/manifests/roomservice.xml

3. Sync the Source Code:

   repo sync

1. Paste following commands for basic setup:

   export USE_CCACHE=1
   export CCACHE_EXEC=/usr/bin/ccache
   ccache -M 50G
   ccache -o compression=true

1. Set Up the Build Environment:

   source build/envsetup.sh

2. Choose the Target:

   lunch lineage_r9q-ap3a-eng

3. Start the Build:

   mka bacon

The compiled ROM will be located in the out/target/product/r9q/ directory.