Installing rmagick gem on Ubuntu 16.04

installing_rmagick_ubuntu_16.04.txt

# the instructions from here: https://stackoverflow.com/questions/3704919/installing-rmagick-on-ubuntu/31089915#31089915
# worked, but only after I added in line 8

sudo apt-get purge graphicsmagick graphicsmagick-dbg imagemagick-common imagemagick imagemagick-6.q16 libmagickcore-6-headers libmagickwand-dev graphicsmagick-libmagick-dev-compat
sudo apt-get autoremove
sudo apt-get install imagemagick libmagickwand-dev
sudo ln -s /usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16/Magick-config /usr/bin/Magick-config
export PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig
gem install rmagick

Just ran into a similar problem trying to install it on Arch Linux:

checking for brew... yes
checking for Ruby version >= 2.3.0... yes
checking for pkg-config... 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


ERROR: Can't install RMagick 4.2.4.
Can't find the ImageMagick library or one of the dependent libraries.
Check the mkmf.log file for more detailed information.

This was the solution:

export PKG_CONFIG_PATH=/usr/lib/pkgconfig
gem install rmagick

I got the path from here: https://archlinux.org/packages/extra/x86_64/imagemagick/files/