gcc for mountain lion

Mountainlion上最新的gcc4.8。安装前需要从Apple'sDeveloper站点(http://connect.apple.com/)下载Xcode以及CommandLineTools(OSXMountainLion)forXcode。安装方法非常简单，解压可以：sudotar-xvfzgcc-mlion.tar.gz-C/.默认的安装目前是in/usr/local.