progrium/buildstep — pull request #21 by nolman (2013-08-04 15:50:59+00:00)
Title: update packages so that rmagick can install

Before:

```
remote: Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
remote:
remote: /build/app/vendor/ruby-2.0.0/bin/ruby extconf.rb
remote: checking for Ruby version >= 1.8.5... yes
remote: checking for gcc... yes
remote: checking for Magick-config... yes
remote: checking for ImageMagick version >= 6.4.9... yes
remote: checking for HDRI disabled version of ImageMagick... yes
remote: checking for stdint.h... yes
remote: checking for sys/types.h... yes
remote: checking for wand/MagickWand.h... no
remote:
remote: Can't install RMagick 2.13.2. Can't find MagickWand.h.
```

I rebuilt the image and confirmed that RMagick will install successfully after these changes. I am not sure if other buildpacks depend explicitly on graphicsmagick-libmagick-dev-compat? Can re-add if they do.