Question

I’ve tried to install gem ray but I got a message (short)

ERROR:  Error installing ray:
    ERROR: Failed to build gem native extension.

The full version of message you can see here

My platform: Ubuntu 11.10 x64

How to fix it?

Answer 1

Here is the key line from your gist:

checking for main() in -lopenal... no

You will need an openal library.
In ubuntu there are usually a few ways it is formatted in the package manager:

Sudo apt-get install openal
openal-dev
libopenal
libopenal-dev
libopenal1

Also as in the comments below, you might have a problem with sndfile, which should be libsndfile1-dev at the time of this edit.

---

source: http://notesofgreg.blogspot.co.uk/2012/04/generic-gem-install-error-solving.html