Good luck with that plan,

https://developer.android.com/distribute/best-practices/deve...

> Starting in November 2021, app updates will be required to target API level 30 or above and adjust for behavioral changes in Android 11. Existing apps that are not receiving updates are unaffected and can continue to be downloaded from the Play Store. Wear OS apps must continue to target API level 28 or higher.

Android is not a POSIX OS, apis like exec() where never part of the public APIs, time to embrace the Java ways of the platform.

https://developer.android.com/ndk/guides/stable_apis#c_libra...