phranque - 2:51 am on Nov 12, 2012 (gmt 0)

i got that backwards, linux is a kernel that uses GNU.
the point was actually that linus torvald's work is irrelevant to the mac.

BSD looks like a pretty significant part of OS X.
Kernel Programming Guide: BSD Overview:
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KernelProgramming/BSD/BSD.html