Building on travis for osx

[ioquatix]

I've been trying to get this to work on travis.

I finally got this to work:

https://github.com/kurocha/teapot/blob/4ad7ae859bbff1a46744406634cf852dd5286ac2/.travis.yml#L16-L19

But, is there something simpler?

Without using RUGGED_USE_SYSTEM_LIBRARIES=y it would fail but I don't know why. It worked locally.

[tenderlove]

Weird. Do you have a link to the error?

[ioquatix]

https://travis-ci.org/kurocha/teapot/jobs/488857155#L1551-L1590

[tenderlove]

Ah fun. I actually got the same error locally. I think this PR will fix it: #779

[ioquatix]

Okay looks good. Once it's merged I can try it. Do you think we can make a patch release?