My app is crashing with the message:
dyld: Symbol not found: _NSURLAuthenticationMethodClientCertificate
Referenced from: /var/mobile/Applicat
I had the same problem using sqlite3 with Xcode 6.3 on a device running iOS 8.1.3 and so using sqlite3 v3.7.13.
The C function sqlite3_errstr() was introduced in sqlite3 v3.7.15.
My code was calling sqlite3_errstr().
The application was crashing on launch.
Setting libsqlite3.dylib as optional (rather than required) did the job.