Impossible build messaging app

[tfe2012]

Trying build test messaging app I get errors

Undefined symbols for architecture arm64:
"OBJC_CLASS$_UNUserNotificationCenter", referenced from:
objc-class-ref in libMessaging.a(messaging_0d72481c6b9f9d4c5456dcb81aa103f1.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[stewartmiles]

This is a duplicate of #42 . You'll need to use Xcode 8 for the moment, until we release a fix that uses weak references to the notification framework.