Version 1.5.5 fails builds with: clang: error: -fobjc-weak is not supported on the current deployment target CLANG_ENABLE_OBJC_WEAK = YES added -fobjc-weak compilation option, what was disabled in project settings. Regression of https://github.com/CocoaPods/Xcodeproj/commit/f356891db634b68710b5c78611b84c14371acd7a