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Apparently I don't have write access to this part of CVS yet, so I can't 
commit this.  Here's the commit message I would've used:

patch [1171735] - Darwin 8's headers disable functionality when POSIX
is enabled.  This prevents the toolbox glue, all of Carbon, and various
other non-POSIX features from compiling.  The POSIX symbols are 
stillused by default, so turning off the #define doesn't hurt.

Additionally, linker flags have changed for Darwin 8, and are different
for Darwin 8/gcc4 (default) and Darwin 8/gcc3.3.  

Approved by Anthony