brew安装GraphicsMagick

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首先要安装Homebrew，参考MongoDB的安装http://blog.csdn.net/qq_25639809/article/details/78749689

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
//按回车确认

//安装jpeg包
brew install libjpeg

//安装jasper包 
brew install jasper

//安装libpng
brew install libpng

//安装freetype包
brew install freetype

//zlib包系统自带
//安装GraphicsMagick
brew install GraphicsMagick