Bus error on Ubuntu 12.04

[RobinClowers]

I'm trying to rotate some images using Rmagick 2.13.2, and I consistently get this bus error exception on a certain image. The same code running against the same image on osx works fine. I created a gist of the output, minus the rake backtrace: https://gist.github.com/RobinClowers/55fdde7f40c254bb9c11

[RobinClowers]

I installed ImageMagick with the package libmagickwand-dev, version 8:6.6.9.7-5ubuntu3.3. Let me know if there is anything else I can provide.

[RobinClowers]

I seem to have fixed this by installing the imagemagick package through apt... Anyone know why that would work? Does RMagick look for an existing binary and fall back to compiling it from source?

[RobinClowers]

So I just found the wiki page that says that package is required... It would be awesome if that was in the readme, can I submit a PR for that?

[RobinClowers]

So I guess it was just a fluke that it worked after I install the imagemagick package, I'm seeing the same failure again.