Installing imagemagick and rmagick

Debian/Ubuntu

Install imagemagick and the dev library:

sudo apt-get install imagemagick
sudo apt-get install libmagick9-dev

For imagemagick to use the fonts in your system:

wget http://www.imagemagick.org/Usage/scripts/imagick_type_gen
chmod +x imagick_type_gen
mkdir ~/.magick
sudo updatedb
./imagick_type_gen >> ~/.magick/type.xml

Finally install rmagick:

sudo gem install rmagick