过去我使用 RMagick 也有 Imagemagick，最近我捆绑安装了更新版本的 RMagick。
重新启动我的 Rails 服务器时出现错误。所以我决定先卸载imagemagick（来自brew），然后卸载rmagick。
我尝试重新安装 rmagick，但遇到了一些麻烦（第一个是我无法从 bundle 命令安装）。我试过gem install rmagick -v '2.13.1'了，但我得到了以下权限错误：
ERROR: While executing gem ... (Errno::EACCES)
Permission denied - /Users/username/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper
我也尝试过sudo并得到了
ERROR: While executing gem ... (Errno::EACCES)
Permission denied - /Users/username/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper
usercomputer:~ Username$ sudo gem install rmagick -v '2.13.1'
Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
extconf.rb:128: Use RbConfig instead of obsolete and deprecated Config.
checking for /usr/bin/gcc-4.2... yes
checking for Magick-config... no
Can't install RMagick 2.13.1. Can't find Magick-config in /Users/username/.rvm/gems/ruby-1.9.3-p194/bin:/Users/Aurelien/.rvm/gems/ruby-1.9.3-p194@global/bin:/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin:/Applications/MAMP/bin/php5/bin:/Applications/MAMP/htdocs/cake/cake/cake/console:/Users/username/.rvm/gems/ruby-1.9.3-p194/bin:/Users/username/.rvm/gems/ruby-1.9.3-p194@global/bin:/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin:/Users/username/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
Gem files will remain installed in /Users/username/.rvm/gems/ruby-1.9.3-p194/gems/rmagick-2.13.1 for inspection.
Results logged to /Users/username/.rvm/gems/ruby-1.9.3-p194/gems/rmagick-2.13.1/ext/RMagick/gem_make.out
当然，我在此过程中做错了什么，但我不确定是什么？
谢谢你的回答。