## 使用第三方库 GraphicsMagick (https://github.com/gographics/gmagick)
export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig

#安装imagick库 (<https://github.com/gographics/imagick>)
mac os
brew install ImageMagick

run 之前执行，将imagick编译
export CGO_CFLAGS_ALLOW="-Xpreprocessor"