Unable to add google sign in in ios 9.0
问题 I had followed all the steps given in developers.google.com. When I try to do #import <GoogleSignIn/GoogleSignIn.h> [GIDSignIn sharedInstance].clientID = kClientID; Got clientID from my plist file. But it shows linker errors like Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_SFSafariViewController", referenced from: objc-class-ref in GoogleSignIn(GIDSignIn.o) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see