Can't install RMagick 2.13.1. Can't find MagickWand.h.

On Mac OS X 10.9, try to update your Xcode if there's a warning about it.
$ brew doctor
I you found some warning, do:
$ sudo /Developer/Library/uninstall-developer-folder

Then try:
$ bundle install
again

That worked fine for me.

I updated to Mountain Lion and started getting this same problem. I had to re-install brew, XCode, the XCode tools - pretty much the whole environment!

I eventually solved this problem using the answer from phopkins above...

brew install pkgconfig

Once that was successfully completed (I had to delete some old symlinks first) then I was able to successfully install the RMagick gem

On CentOS 6.5 x64, it was pretty easy:

yum install ImageMagick ImageMagick-devel

gem install rmagick -v '2.13.2'

I was able to fix this by upgrading to 2.13.2

I had a problem after update to Maverics.
It have lost a lot of linkings.
In my case I had to refresh links to pkg-config

brew unlink pkg-config
brew link pkg-config

Then installing rmagick worked like a charm.

I ran into this because I'd run OS X's Migration Assistant and nothing was relinked after the migration. You need to check the output of `Wand-config --ldflags --libs`. In my case it gave:

$ Wand-config --ldflags --libs
/usr/local/bin/Wand-config: line 50: pkg-config: command not found
/usr/local/bin/Wand-config: line 53: pkg-config: command not found

After relinking pkg-config, libpng, and libfreetype, that became:

$ Wand-config --ldflags --libs
-L/usr/local/Cellar/imagemagick/6.8.8-9/lib -lMagickWand-6.Q16 -lMagickCore-6.Q16
-L/usr/local/Cellar/imagemagick/6.8.8-9/lib -lMagickWand-6.Q16 -lMagickCore-6.Q16

And then:

$ gem install rmagick
Building native extensions. This could take a while...
Successfully installed rmagick-2.13.2
Parsing documentation for rmagick-2.13.2
Done installing documentation for rmagick after 4 seconds
1 gem installed

For Ubuntu:

sudo apt-get install imagemagick libmagickwand-dev
gem install rmagick

Try reinstalling both Imagemagick and PkgConfig. That should fix it for Mavericks

- `brew update && brew upgrade`
- `brew reinstall imagemagick`
- `brew reinstall pkgconfig`

This worked for me on Mac OsX

Install Imagemagick:

brew remove imagemagick
brew install imagemagick

Make sure pkg-config is correctly linked:

brew uninstall pkg-config
brew install pkg-config
brew unlink pkg-config && brew link pkg-config

Install gem

gem install rmagick

All brew options failed to install rmagick 2.13.1 on yosemite 10.10

this worked
get the latest RVM
> \curl -sSL

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| bash -s stable --ruby
> rvm install 2.1.1
> rvm use 2.1.1
>
> download and install the package file

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(I used pacifist to install)

Confirm location of MagickCore.pc file
>mdfind magickcore.pc

eg. /opt/ImageMagick/lib/pkgconfig/MagickCore.pc

> Manually download rmagick-2.15.2.gem file

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from that dir
> sudo C_INCLUDE_PATH=/opt/ImageMagick/include/ImageMagick-6/ PKG_CONFIG_PATH=/opt/ImageMagick/lib/pkgconfig gem install --local rmagick-2.15.2.gem

If you are having issues with bundle installer still complaining about 2.13.1

In your gem file / gem.lock file upgrade ALL dependencies
> rmagick (2.13.1) - > rmagick (>= 2.15.2)