Can't find MagickWand.h

While trying to initialize a project into a new gemset with bundler, I ran into trouble installing RMagick. It’s not the first time this has happened.

$ bundle
...
Installing rmagick (2.13.1) with native extensions /Users/brian/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/installer.rb:533:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

        /Users/brian/.rvm/rubies/ruby-1.8.7-p352/bin/ruby extconf.rb --with-opt-include=/usr/local/include
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... yes
checking for ImageMagick version >= 6.4.9... yes
checking for HDRI disabled version of ImageMagick... yes
checking for stdint.h... yes
checking for sys/types.h... yes
checking for wand/MagickWand.h... no

Can't install RMagick 2.13.1. Can't find MagickWand.h.
*** 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=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/Users/brian/.rvm/rubies/ruby-1.8.7-p352/bin/ruby


Gem files will remain installed in /Users/brian/.rvm/gems/ruby-1.8.7-p352@wg/gems/rmagick-2.13.1 for inspection.
Results logged to /Users/brian/.rvm/gems/ruby-1.8.7-p352@wg/gems/rmagick-2.13.1/ext/RMagick/gem_make.out

I knew that I had MagickWand.h:

$ mdfind MagickWand.h
/usr/local/include/ImageMagick/wand/MagickWand.h

Trying to set the configuration options was not helpful. Finally, I read the mkmf.log which said that one of the include paths was $MAGICK_HOME/include/ImageMagick.

The fix was to set the MAGICK_HOME variable before the bundle install:

$ MAGICK_HOME=/usr/local bundle

1. James — November 2, 2011

   Hi, I’m trying to use your approach, but I’m not sure how to do the last step. In which file do I set the MAGICK_HOME?

2. Brian Hempel — November 2, 2011

   MAGICK_HOME is a shell variable, so you set it in the terminal—not any particular file. At the end of the post, I set it just before running the `bundle` command. You can also set it in a separate command by running:

   $ export MAGICK_HOME=path_here

   Let me know if you have any other questions.

3. James — November 2, 2011

   Ah yes, I realized this shortly after posting my comment. Oops.

   My problem is different though. I’m now noticing that the installation can’t even find stdint.h or types.h Any ideas? I know the files are there, it just seems like setting MAGICK_HOME doesn’t work for me. :|

   checking for Ruby version >= 1.8.5… yes
   checking for /usr/bin/gcc… yes
   checking for Magick-config… yes
   checking for ImageMagick version >= 6.3.5… yes
   checking for HDRI disabled version of ImageMagick… yes
   checking for stdint.h… no
   checking for sys/types.h… no
   checking for wand/MagickWand.h… no

4. James — November 2, 2011

   It worked just now! No idea why! LOL Thanks of your post.

5. Rob — January 4, 2012

   This worked for me:

   C_INCLUDE_PATH=/opt/local/include/ImageMagick/ gem install rmagick

6. Jay — March 30, 2012

   @Rob

   You are a star and you know it! :-)
   Worked like clock work
   C_INCLUDE_PATH=/usr/local/include/ImageMagick/ gem install rmagick

7. Ted — May 14, 2012

   Thanks so much! The following worked for me also

   C_INCLUDE_PATH=/usr/local/include/ImageMagick/ gem install rmagick

What are your thoughts?