Debian gem install RMagick

I tried to install RMagick gem on my Debian box and got the following error:

checking for Magick-config... no
Can't install RMagick 2.3.0. Can't find Magick-config in [...]

I installed libmagickcore-dev:

sudo apt-get install libmagickcore-dev

But I still had an error with:

Can't find MagickWand.h

The problem was solved by installing libmagickwand-dev:

sudo apt-get install libmagickwand-dev

Hope that helps!