Usually it's issues with assumptions about the completeness of the platform; e.g. ZeroMQ assumes that if it's on a UNIX-ey platform it should use UNIX sockets r

Usually it's issues with assumptions about the completeness of the platform; e.g. ZeroMQ assumes that if it's on a UNIX-ey platform it should use UNIX sockets rather than TCP and doesn't check to see if it's actually supported. I'm not very familiar with OSX, but I'd be surprised if there weren't differences between it and mainline Linux that needed special care and I see this as similar.