Step

first

cd external/bluetooth/bluedroid
git remote add Saber https://gitlab.com/SaberMod/android-external-bluetooth-bluedroid.git
git fetch Saber
git checkout Saber/android-5-1

second, in precuilt/gcc/arm/

git clone git@gitlab.com:SaberMod/arm-linux-androideabi-4.8.git
(should ask to you the passprahse)
* rename it arm-linux-androideabi-4.8-Saber

cp -r arm-linux-androideabi-4.8-Saber arm-linux-androideabi-4.8