Use dylib extension for darwin

[jvlmdr]

I installed portmidi on OS X from the homebrew formula and it created libportmidi.dylib rather than .so. This led to an error when I did (ql:quickload :portmidi) since it could not find the .so file. I was able to fix this by adding the line (:darwin "libportmidi.dylib") before (:unix ...) in setup.lisp.

[chfin]

Thanks for the report! I added your suggestion, but I can't test it here. Could you confirm that it works for you?

That being said, I'm a bit surprised that this still works at all. I don't really use CL anymore, so I don't maintain this library. In case you intend to do a bit more with it, feel free to create a fork. Maybe then you also want to put it on Quicklisp.

[jvlmdr]

Hey, yep, I can confirm that it works on my mac laptop (OS X 11.2) with portmidi version 217_2 installed with homebrew