To get started with LineageOS, you'll need to get familiar with Git and Repo.
To initialize your local repository using the LineageOS trees, use a command like this:
repo init -u git://github.com/LineageOS/android.git -b cm-11.0
mkdir -p .repo/local_manifests
Copy gtelwifi.xml from this repository to .repo/local_manifests
Then to sync up:
repo sync -j20 --force-sync
. build/envsetup.sh && lunch lineage_gtelwifi-userdebug
./vendor/cm/get-prebuilts
brunch lineage_gtelwifi-userdebug