如何将 RMagick gem 安装到 Ubuntu？我在 SO 上找到了一些线程，其中一些直接指出了在 Ubuntu 系统上的安装，但没有一个对我有用。
这是我运行sudo gem install rmagick时得到的输出
Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
/opt/bitnami/ruby/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... yes
Warning: Found more than one ImageMagick installation. This could cause problems at runtime.
/opt/bitnami/common/bin/Magick-config reports version 6.7.5 Q16 is installed in /opt/bitnami/common
/usr/bin/Magick-config reports version 6.6.9 Q16 is installed in /usr
Using 6.7.5 Q16 from /opt/bitnami/common.
checking for ImageMagick version >= 6.4.9... yes
checking for HDRI disabled version of ImageMagick... yes
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
No package 'MagickCore' found
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
No package 'MagickCore' found
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
No package 'MagickCore' found
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
No package 'MagickCore' found
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=/opt/bitnami/ruby/bin/ruby
Gem files will remain installed in /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.2 for inspection.
Results logged to /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.2/ext/RMagick/gem_make.out
它位于 Amazon EC2 服务器上。如果我尝试只运行gem install rmagick，我会得到
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions into the /opt/bitnami/ruby/lib/ruby/gems/1.9.1 directory.
你能帮我吗，请，如何解决这个问题？
非常感谢
编辑：我尝试过的：
sudo apt-get install libmagickwand-dev
Reading package lists... Done Building dependency tree Reading state information... Done libmagickwand-dev is already the newest version. The following packages were automatically installed and are no longer required: libgraphicsmagick3 libmagick++4 libgraphicsmagick++3 libgraphicsmagick1-dev libgraphics-magick-perl libperl5.14 libgraphicsmagick++1-dev Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 40 not upgraded.sudo apt-get install libmagickwand-dev imagemagick
正在读取包列表... 完成 构建依赖树 正在读取状态信息... 完成 imagemagick 已经是最新版本。libmagickwand-dev 已经是最新版本。以下软件包已自动安装且不再需要： libgraphicsmagick3 libmagick++4 libgraphicsmagick++3 libgraphicsmagick1-dev libgraphics-magick-perl libperl5.14 libgraphicsmagick++1-dev 使用 'apt-get autoremove' 删除它们。0 升级，0 新安装，0 删除，40 未升级。
apt-get 安装 libmagickwand-dev
E: 无法打开锁定文件 /var/lib/dpkg/lock - open (13: Permission denied) E: 无法锁定管理目录 (/var/lib/dpkg/)，你是 root 吗？
sudo apt-get install libmagickwand-dev
读取包列表...完成构建依赖树读取状态信息...完成 libmagickwand-dev 已经是最新版本。以下软件包已自动安装且不再需要： libgraphicsmagick3 libmagick++4 libgraphicsmagick++3 libgraphicsmagick1-dev libgraphics-magick-perl libperl5.14 libgraphicsmagick++1-dev 使用 'apt-get autoremove' 删除它们。0 升级，0 新安装，0 删除，40 未升级。
但仍然是上面相同的错误消息。