ruby – 无法在debian 7.6上安装rmagick(包冲突)

我尝试apt-get install libmagickwand-dev libmysqlclient-dev和apt-get install libmagick -dev但我无法安装.实际上,之后发生了冲突：

maxime@ns504687:/opt/redmine$sudo aptitude why-not libmagick++-dev
i   imagemagick                         Suggests  html2ps
p   html2ps                             Depends   perlmagick
p   graphicsmagick-libmagick-dev-compat Provides  perlmagick
p   graphicsmagick-libmagick-dev-compat Conflicts libmagick++-dev

这是apt-get install libmagickwand-dev libmysqlclient-dev的结果

maxime@ns504687:/opt/redmine$sudo apt-get install libmagickwand-dev libmysqlclient-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
libmysqlclient-dev is already the newest version.
libmysqlclient-dev set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libmagickwand-dev : Depends: libmagickcore-dev (= 8:6.7.7.10-5+deb7u3) but it is not going to be installed
E: Unable to correct problems,you have held broken packages.

这里是apt-get install libmagick -dev的结果：

maxime@ns504687:/opt/redmine$sudo apt-get install libmagick++-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libmagick++-dev : Depends: libmagickcore-dev (= 8:6.7.7.10-5+deb7u3) but it is not going to be installed
                   Depends: libmagickwand-dev (= 8:6.7.7.10-5+deb7u3) but it is not going to be installed
E: Unable to correct problems,you have held broken packages.

我在网上尝试了很多解决方案,但没有人工作过.

你能帮我吗 ？