I did these steps successfully:
- install node.js and the version is 4.0
- brew install watchman
- brew install flow
- the version of OS X Yosemite is 10.10.5
- the version of Xcode is 6.4
- npm install -g react-native-cli
- react-native init HelloWorld
In the end, I run the HelloWorld.xcodeproj,and it build failed like the picture above. can you help me to solve this problem, thx