error: Undefined symbol: _OBJC_CLASS_$_GKLocalPlayer

[Jeevan Shrestha]

I integrated firebase into my cocs2dx project with firebase_cpp_sdk following the firebase docs guidelines. I installed the firebase through cocoapods, but while building for iOS device(ipad4). ( I'm using Xcode Xcode 12.4)
I’m getting this errors: how do I solve it? 

Undefined symbols for architecture armv7:

  "_OBJC_CLASS_$_GKLocalPlayer", referenced from:

      objc-class-ref in firebase_auth(credential_ios.mm.o)

ld: symbol(s) not found for architecture armv7

[paulbeu...@google.com]

You may need to explicitly add linkage of the GameKit framework to the build.