iOS Question GoogleSignIn.h File not found error

Hello all,
I'm trying to compile my first real application in ios.
The app uses Firebase auth and is a porting from an already working B4A one.
i keep getting a "GoogleSignIn.h File not found" error on compile process..
Anyone can help?

Extract from compilation log:

/Users/<user id>/Desktop/B4iBuildServer/Libs/iFirebaseAuth.h:2:9: fatal error: 'GoogleSignIn/GoogleSignIn.h' file not found
#import <GoogleSignIn/GoogleSignIn.h>
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~