Can't compile with clock_gettime() fcn on Android

NDK version is 11c, and I have NDK API level set to ‘android-19’ In the project settings.

I’m not really on the master branch, I’m in a modified 4.12 branch in a fork of the engine from the start of June, (the github master branch seemed like the closest option I could pick) and, because of some things I’ve added, I won’t be able to compile if I switch branches.