我用brew来安装imagemagick，没关系。在终端输入转换我得到以下内容：
Version: ImageMagick 6.9.2-6 Q16 x86_64 2015-11-15
现在，当我正在运行bundle install时，我收到以下错误：
...lots of warnings first, then a couple of errors...
rmmain.c:1724:28: error: use of undeclared identifier 'MagickSupport'
features = rb_str_new2(MagickSupport);
^
5 errors generated.
make: *** [rmmain.o] Error 1
Gem files will remain installed in /Users/phil/src/proj/vendor/bundle/ruby/2.0.0/gems/rmagick-2.13.4 for inspection.
Results logged to /Users/phil/src/proj/vendor/bundle/ruby/2.0.0/gems/rmagick-2.13.4/ext/RMagick/gem_make.out
An error occurred while installing rmagick (2.13.4), and Bundler cannot continue.
Make sure that `gem install rmagick -v '2.13.4'` succeeds before bundling.
当我运行sudo gem install rmagick -v '2.13.4'时，我得到了同样的错误。如果我没有sudo运行，我会收到权限错误。
但是，如果我运行sudo gem install rmagick，它就有效。我得到了这个输出：
PhilipPro:proj phil$ sudo gem install rmagick
Building native extensions. This could take a while...
Successfully installed rmagick-2.15.4
Parsing documentation for rmagick-2.15.4
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/RMagick2.bundle, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmagick.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmdraw.o, skipping
...
1 gem installed
这里发生了什么？