> - Darwin has no prototype for poll(), so in glib, do what it already 
> did
>   for Solaris.
>
> fixes build on Darwin.

This doesn't seem to be right in all cases. On my system it actually 
breaks the build, since I do have poll() (in /usr/include/poll.h).
This is on OS X 10.3.7.

Cheers,
Marc