NixOS/nixpkgs — pull request #1151 by kowey (2013-10-30 16:20:17+00:00)
Title: libusb1: avoid -lgcc_s on darwin

I confess I don't really understand the implications of this, but other packages seem to use the same fix, stating only that libgcc_s isn't available. I'm just trying to make gnupg build! (it depends on libusb)