Warning: /usr/local/lib/pkgconfig isn't writable. This can happen if you "sudo make install" software that isn't managed by by Homebrew. If a brew tries to write a file to this directory, the install will fail during the link step. You should probably `chown` /usr/local/lib/pkgconfig xcrun: error: active developer path ("/Volumes/Xcode 4.5 DP4/Xcode45-DP4.app/Contents/Developer") does not exist, u
