The compiler failed to generate an executable file. (RuntimeError)
Same problem occurred and I finally solved it. Here are the steps I followed:
- Xcode, Xcode CLT
sudo xcodebuild -licensesudo port upgrade outdatedsudo port install apple-gcc42rvm reinstall 1.9.3#important!
Really, I think just first,second and last steps required, but can not test it.
Be sure to open XCode after updates. I found that I had to open it and accept the new license agreement after a recent update of XCode via the App Store. Otherwise I received the "The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first."
If you're using rbenv and homebrew:
brew tap homebrew/dupes ; brew install apple-gcc42