strongSwan

Hello, I'm trying to compile strongswan for Andorid 64 bit processors (arm64-v8a).
I'm using 5.4.0dr6 tarball as a source set and compliling on latest Mac OSX 10.11.3. Android NDK verison is latest - r10e
./configure and make dist steps work fine and I also able to build libraries with ndk-build for existing architectures (armeabi x86 mips) without problem.

However, when I've added arm64-v8a to APP_ABI in Applicaiton.mk, ndk-build fails always with error below:

[arm64-v8a] Compile        : strongswan <= mutex.c
jni/strongswan/src/libstrongswan/threading/mutex.c: In function 'timed_wait_abs':
jni/strongswan/src/libstrongswan/threading/mutex.c:263:3: warning: implicit declaration of function 'pthread_cond_timedwait_monotonic' [-Wimplicit-function-declaration]
   timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
   ^
[arm64-v8a] SharedLibrary  : libstrongswan.so
./obj/local/arm64-v8a/objs/strongswan/threading/mutex.o: In function `timed_wait_abs':
/Users/alexs/Documents/Workspace/AndroidStudio/vpn-shield/strongswan/src/frontends/android/app/src/main/jni/strongswan/src/libstrongswan/threading/mutex.c:270: undefined reference to `pthread_cond_timedwait_monotonic'
/Users/alexs/Documents/Workspace/AndroidStudio/vpn-shield/strongswan/src/frontends/android/app/src/main/jni/strongswan/src/libstrongswan/threading/mutex.c:263: undefined reference to `pthread_cond_timedwait_monotonic'
collect2: error: ld returned 1 exit status
make: *** [obj/local/arm64-v8a/libstrongswan.so] Error 1

After some googling I've tried to remove that function redefine from mutex.c, by removing this lines https://github.com/strongswan/strongswan/blob/master/src/libstrongswan/threading/mutex.c#L241-L244 .

And it worked, ndk-build completed successfully and app seems to work fine on 64bit device.

So, is it fine to use such approach, and do you plan to add arm64-v8a to supported architectures for Android?