To build My AOSP from source, you'll need to be familiar with Git and Repo.
To initialize your local repository, use this command:
repo init -u https://github.com/USBhost/My-AOSP-manifest.git -b O
Then to sync source, use this command:
repo sync
After syncing is done, use these commands to build:
1.) . build/envsetup.sh
2.) lunch ## choose flounder
"make otapackage -j12" like that