Error Building Cairo

[Ryan Schmidt]

> I'm not sure why it's trying to use the ghostscript library when it's not available. But you're at least partly suffering from...
> 
> https://trac.macports.org/ticket/33827
> 
> ...because I see libspectre being used in your log as well.


Ah: libspectre requires ghostscript.

Anyway. I'm enlisting the help of the cairo developers. Hopefully they'll suggest what we need to do.