Why is Fedora not a Free GNU/Linux distributions?

[Björn Persson]

Gordon Messmer wrote:
> GNU/Linux is an operating system.  It implements the interfaces
> described by POSIX.  Applications written to conform to that standard
> will build and run on GNU/Linux.
>
> Linux is a kernel.  It implements no documented standard (and maintains
> a policy against stable interfaces).  Applications do not run on Linux.

Does Linux not implement the system calls described by POSIX?

Björn Persson