[DRE-maint] Bug#761804: rake: runs programs from /usr/local

[Caitlin Matos]

This doesn't quite answer your question or fix the bug (I'll leave that 
to someone more familiar with stable's ruby 1.9.x package)...

> I tried building a new version of ruby extension because the one in
> debian is broken.
>
> The extension is found here: https://github.com/larskanis/opengl.git.

Broken how? If you mean very outdated, I am working on that right now. 
Otherwise, can you file a bug report for ruby-opengl, please?

Caitlin