system issue output for yeoman issue

gistfile1.txt

nick.heiner:~/hacks/yeoman-build-test $ yeoman --version
0.9.6
nick.heiner:~/hacks/yeoman-build-test $ echo $PATH $NODE_PATH
/Users/nick.heiner/.rvm/gems/ruby-1.9.3-p327/bin:/Users/nick.heiner/.rvm/gems/ruby-1.9.3-p327@global/bin:/Users/nick.heiner/.rvm/rubies/ruby-1.9.3-p327/bin:/Users/nick.heiner/.rvm/bin:/opt/pose/svnmerge:/Users/nick.heiner/.rvm/bin:/Users/nick.heiner/Downloads/scala-2.9.2/bin:/usr/local/mysql/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin
nick.heiner:~/hacks/yeoman-build-test $ brew doctor
Warning: Your Homebrew is outdated
You haven't updated for at least 24 hours, this is a long time in brewland!
Warning: Some installed formula are missing dependencies.
You should `brew install` the missing dependencies:

    brew install libpng

Run `brew missing` for more details.
Error: Homebrew doesn't know what compiler versions ship with your version of
Xcode. Please `brew update` and if that doesn't help, file an issue with
the output of `brew --config`:
  https://github.com/mxcl/homebrew/issues

Thanks!
Warning: /usr/bin occurs before /usr/local/bin
This means that system-provided programs will be used instead of those
provided by Homebrew. The following tools exist at both paths:

    gcov-4.2
    git
    git-cvsserver
    git-receive-pack
    git-shell
    git-upload-archive
    git-upload-pack
    gitk
    mvn

Consider amending your PATH so that /usr/local/bin
occurs before /usr/bin in your PATH.