cd path/to/msm8916-mainline/linux
$ source path/to/pmbootstrap/helpers/envkernel.sh

# Initialize kernel configuration
$ make msm8916_defconfig pmos.config

# Compile kernel; replace <cores> with the number of cores you'd like to use for compilation
$ make -j<cores>

# Create postmarketOS package with your built kernel
$ pmbootstrap build --envkernel linux-postmarketos-qcom-msm8916