In gnupg2 2.1.14 there is a check for Android in configure.ac:
*-linux-androideabi)
This only works for 32-bit ARM (arm-linux-androideabi) and not for ARM64 (aarch64-
linux-android) or e.g. X86 or X86-64. A solution could be to change the above line to:
*-linux-android*)
as is done in the attached patch.