The first recommandation would be to upgrade your library to the newest version (=< 2.13.3), but for some reasons sometime it is not possible yet.
If you are Archlinux user you'll probably end with an error message like :
Can't install RMagick 2.13.2.
RMagick does not work when ImageMagick is configured for High Dynamic Range Images.
Don't use the --enable-hdri option when configuring ImageMagick.
If you google a bit, you'll find the imagemagick-no-hdri AUR package.
Unfortunately is does not seem up to date.
I've tweak the PKGBUILD in order to bring a newer version of imagemagick-no-hdri
Installation :
Remove the base package :
sudo pacman -Rdd imagemagick
Download and build my no-hdri version :
wget https://raw.githubusercontent.com/Electron-libre/imagemagick-no-hdri/master/PKGBUILD
makepkg
Install the package :
sudo packman -U imagemagick-no-hdri-6.8.9.6-1-x86_64.pkg.tar.xz
Edit : I've made an Aurball, the new package is now available on AUR