#import "ArtsyToken.h"
#import "ArtsyAuthentication.h"
#import "ArtsyAuthentication+Facebook.h"
#import "ArtsyAuthentication+Twitter.h"
#import "ArtsyToken.h"
#import "ArtsyAuthentication.h"
#if __has_include("ArtsyAuthentication+Facebook.h")
#import "ArtsyAuthentication+Facebook.h"
#endif
#if __has_include("ArtsyAuthentication+Twitter.h")
#import "ArtsyAuthentication+Twitter.h"
#endif

Use if includes for fb/tiwtter
Use if includes for fb/tiwtter