OS X
brew install cairo pkg-config
go get github.com/ungerik/go-cairo
Ubuntu sudo apt-get install libcairo2-dev pkg-config
go get github.com/ungerik/go-cairo
... I always think there should be a "default" instruction page linked to somewhere that explains what brew and apt-get are (and other things). I mean, I know you can't be expected to go to the lengths of explaining this stuff for every single project, but this is the kind of thing that will inspire the next generation. So maybe we, as a community could come up with a, "you don't know what this is? look here..." kind of page that people can put on their github projects.