supercollider/supercollider — pull request #740 by gusano (2013-02-27 01:03:19+00:00)
Title: cmake: fix build on archlinux

- add "ARCHLINUX" cmake option
- add `-lpthread` to scsynth and sclang link flags
- fix "undefined reference to symbol 'pthread_mutexattr_settype@@GLIBC_2.2.5'" error

Reported in [this thread](http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/link-failure-for-pthreads-on-Arch-Linux-td7594503.html)