我在 Centos 5 上安装 RMagick rubygem 时遇到问题。我已按照 中详细的步骤操作http://rmagick.rubyforge.org/install2-linux.html http://rmagick.rubyforge.org/install2-linux.html但当我尝试时：
sudo gem install rmagick
结果是：
Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 2.11.0. Can't find Magick-config in /usr/bin:/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
--without-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=/usr/local/bin/ruby
Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.11.0 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.11.0/ext/RMagick/gem_make.out
目录 /usr/local/bin 包含 Magick-config 但我无法让 rubygems 在那里查看。我尝试了以下方法，但结果是相同的：
sudo gem install rmagick -- --with-opt-dir=/usr/local/bin
任何建议，将不胜感激。
我最近将 ImageMagick 6.5.4.7 从 CentOS6 向后移植到 CentOS5，因此现在安装 rmagick 应该更容易：
rpm -Uvh http://rbel.co/rbel5
yum install ImageMagick-devel ImageMagick-c++-devel
gem install rmagick
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