当我尝试安装rmagic：
gem install rmagic 它给错误：
Building native extensions. This could take a while... ERROR: Error installing rmagick: ERROR: Failed to build gem native extension. /home/biske/.rbenv/versions/2.0.0-p247/bin/ruby extconf.rb checking for Ruby version >= 1.8.5... yes checking for gcc... yes checking for Magick-config... yes checking for ImageMagick version >= 6.4.9... yes checking for HDRI disabled version of ImageMagick... yes checking for stdint.h... yes checking for sys/types.h... yes checking for wand/MagickWand.h... no Can't install RMagick 2.13.2. Can't find MagickWand.h. *** 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=/home/biske/.rbenv/versions/2.0.0-p247/bin/ruby Gem files will remain installed in /home/biske/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rmagick-2.13.2 for inspection. Results logged to /home/biske/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rmagick-2.13.2/ext/RMagick/gem_make.out
我试图search问题，发现我缺lesslibmagickwand-dev。 我试图安装它：
sudo apt-get install libmagickwand-dev
但它会产生错误：
The following packages have unmet dependencies: libmagickwand-dev : Depends: libmagickcore-dev (= 8:6.7.7.10-5ubuntu2) but it is not going to be installed E: Unable to correct problems, you have held broken packages.
如果我尝试安装它：
sudo apt-get install libmagickcore-dev
它给错误：
The following packages have unmet dependencies: libmagickcore-dev : Depends: librsvg2-dev but it is not going to be installed E: Unable to correct problems, you have held broken packages.
如果我尝试安装它：
sudo apt-get install librsvg2-dev
它给错误：
The following packages have unmet dependencies: librsvg2-dev : Depends: libglib2.0-dev (>= 2.24.0) but it is not going to be installed Depends: libgdk-pixbuf2.0-dev (>= 2.23.5-2) but it is not going to be installed Depends: libcairo2-dev (>= 1.2.0) but it is not going to be installed E: Unable to correct problems, you have held broken packages.
如果我尝试安装libglib2.0-dev：
sudo apt-get install libglib2.0-dev
它给错误：
The following packages have unmet dependencies: libglib2.0-dev : Depends: libglib2.0-0 (= 2.36.0-1ubuntu1) but 2.36.0-1ubuntu2 is to be installed Depends: libglib2.0-bin (= 2.36.0-1ubuntu1) E: Unable to correct problems, you have held broken packages.
如果我安装libglib2.0-0：
sudo apt-get install libglib2.0-0
它给：
libglib2.0-0 is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
如果我安装libglib2.0-bin：
sudo apt-get install libglib2.0-bin
它给：
Reading package lists... Done Building dependency tree Reading state information... Done libglib2.0-bin is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
这两个库安装，但再次发出：
sudo apt-get install libglib2.0-dev
它给出同样的错误：
The following packages have unmet dependencies: libglib2.0-dev : Depends: libglib2.0-0 (= 2.36.0-1ubuntu1) but 2.36.0-1ubuntu2 is to be installed Depends: libglib2.0-bin (= 2.36.0-1ubuntu1) E: Unable to correct problems, you have held broken packages.
这里可能是什么问题？
我使用的是Ubuntu 13.04，rbenv，ruby 2.0.0，如果有的话。
试试这个
首先安装imagemagick
sudo apt-get install imagemagick
接着
sudo apt-get install libmagickwand-dev
解决方法是添加ppa，这些库可以找到。
添加PPA：
sudo add-apt-repository ppa:ricotz/testing
然后更新软件包列表：
sudo apt-get update
最后安装它：
sudo apt-get install libmagickwand-dev
尝试清除你的apt库，并首先删除任何破损的包：
sudo apt-get update sudo apt-get autoclean sudo apt-get clean sudo apt-get autoremove
如果系统识别出任何损坏的软件包，请将其强制删除（用您自己的软件名称替换软件包名称）：
sudo dpkg --remove -force --force-remove-reinstreq package_name
然后重新安装所有丢失的包。
您只需要安装：
sudo apt-get install libmagickwand-dev
这是这个博客上的好例子
下面的命令将解决你的问题。 它帮助我安装rmagick 。
sudo apt-get install libdjvulibre-dev libjpeg-dev libtiff-dev libwmf-dev libmagickcore-dev libmagickwand-dev libmagick++-dev
这对我工作：