How To Build Android's Adb From Source Code?

I'm trying to build Android's adb from source code, which I downloaded from here. I tried to use NDK21 and its ndk-build, but got this error Android NDK: APP_PLATFORM not set. Defa

Solution 1:

The mentioned project is part of AOSP and should be built within AOSP build but it seems that it is already outdated because AOSP master is now using this one: https://android.googlesource.com/platform/packages/modules/adb/+/refs/heads/master