在使用brew安装软件的时候，可能会遇到这样一个错误，其实这个错误的解决办法已经给你了

我们来分析一下

我是在安装graphicsmagick是出现的错误

==> Pouring graphicsmagick-1.3.26.sierra.bottle.tar.gz

Error: The `brew link` step did not complete successfully

The formula built, but is not symlinked into /usr/local

Could not symlink lib/libGraphicsMagick++.dylib

Target /usr/local/lib/libGraphicsMagick++.dylib

already exists. You may want to remove it:

  rm '/usr/local/lib/libGraphicsMagick++.dylib'

To force the link and overwrite all conflicting files:

  brew link --overwrite graphicsmagick

To list all files that would be deleted:

  brew link --overwrite --dry-run graphicsmagick

其实错误的下边就是解决办法

already exists. You may want to remove it:

  rm '/usr/local/lib/libGraphicsMagick++.dylib'

To force the link and overwrite all conflicting files:

  brew link --overwrite graphicsmagick

To list all files that would be deleted:

  brew link --overwrite --dry-run graphicsmagick

依次执行这三句命令，就可以了

这里的错误有可能是文件夹，删除就ok了

如果报错代码如： 

Error: The `brew link` step did not complete successfully The formula built, but is not symlinked into /usr/local/imagemagick/ not writable. 

像遇到这种问题，我的解决方法是，比较简单粗暴： 

rm -fr /usr/local/imagemagick/ 

brew link imagemagick 

然后就可以了