参考：http://stackoverflow.com/questions/10344821/gem-install-pg-doesnt-work-on-osx-lion
以下を実行して下さい。
sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2
もしくは、
sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
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XCodeを4.5にバージョンアップした後に、gem(native extensions)のインストールで「You have to install development tools first.」と言われてしまった時の対処法
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