How to fix this
Daos-MacBook-Pro:App daomanhhai$ npm install react-native-gcm-android --save App@0.0.1 /Volumes/Dev/react/projects/App +-- react-native-gcm-android@0.2.0 +-- UNMET PEER DEPENDENCY react-native-system-notification@^0.1.2 npm WARN react-native-gcm-android@0.2.0 requires a peer of react-native-system-notification@^0.1.2 but none was installed.