Rails: Installing PG gem on OS X – failure to build native extension

Same error for me and I didn’t experience it until I downloaded OS X 10.9 (Mavericks). Sigh, another OS upgrade headache.

Here’s how I fixed it (with homebrew):

• Install another build of Xcode Tools (typing brew update in the terminal will prompt you to update the Xcode build tools)
• brew update
• brew install postgresql

After that gem install pg worked for me.