Ruby gem rmagick won't install on Mac OS X

Question

I understand that this question has been asked a lot earlier, but none of the solutions worked for me and I'm really desperate right now.

I'm trying to get rMagick to install using gem for an installation of diaspora. I already installed imagick via homebrew and when trying to run gem install rmagick I receive this error:

ERROR:  Error installing rmagick:
    ERROR: Failed to build gem native extension.

        /Users/tobischweiger/.rvm/rubies/ruby-1.9.3-p385/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc-4.2... yes
checking for Magick-config... no
Can't install RMagick 2.13.2. Can't find Magick-config in /Users/tobischweiger/.rvm/gems/ruby-1.9.3-p385@diaspora/bin:/Users/tobischweiger/.rvm/gems/ruby-1.9.3-p385@global/bin:/Users/tobischweiger/.rvm/rubies/ruby-1.9.3-p385/bin:/Users/tobischweiger/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/usr/local/git/bin

*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/tobischweiger/.rvm/rubies/ruby-1.9.3-p385/bin/ruby


Gem files will remain installed in /Users/tobischweiger/.rvm/gems/ruby-1.9.3-p385@diaspora/gems/rmagick-2.13.2 for inspection.
Results logged to /Users/tobischweiger/.rvm/gems/ruby-1.9.3-p385@diaspora/gems/rmagick-2.13.2/ext/RMagick/gem_make.out

I'm not very experienced with gem and homebrew and I'm wondering if somebody could help me out.

Answer 1

Run this (using homebrew) before attempting to install the gem.

brew install imagemagick

Answer 2

This is the less destructive version using homebrew, rmagic also doesn't work with imagemacigk version 7

ImageMagick Version 6.4.9 or later (6.×.x). Version 7 is NOT yet supported; ETA April 2019 (https://github.com/rmagick/rmagick/pull/299 )

(from Readme)

. You can get ImageMagick from www.imagemagick.org., so with brew try this

brew install imagemagick@6
PKG_CONFIG_PATH=/usr/local/opt/imagemagick@6/lib/pkgconfig gem install rmagick

Answer 3

I'm using OS X Lion.

I ran brew doctor and saw that imagemagick was unlinked so it told me to run brew link imagemagick.

Then I closed and re-opened my terminal and everything worked thankfully.