Does someone have a cannonical example of setting up PostgreSQL with PLV8?

I'm hoping that someone can either post or point me to a guide for setting up PostgreSQL (9.4) and PLV8.

I'm not an expert at PostgreSQL by any means and have been reading about and wanting to play around with PLv8 specifically in conjunction with the JSONB fields added in 9.4. I'm not able to find a good guide to even start from. I'd prefer something targetting Ubuntu 14.04 LTS, but any walkthrough would be nice.

Is this something I have to compile? Is there a plugin repository with pre-built extensions?

Thanks in advance.