NixOS/nixpkgs — pull request #5245 by ftrvxmtrx (2014-12-06 15:23:02+00:00)
Title: plan9port: make it actually work

* Add "which" dependency, otherwise it builds with lots of "command not found" errors.
* -lgcc_s, otherwise many commands basically fail without pthread_cancel.
* Fix X11 dependencies, otherwise it would be plan9port with none of UI programs working.