Trouble compiling XFree86 under 4.9R

[Patrick Burnett]

Here's the scenario:

I installed 4.9R via FTP with the Developer option from the setup
menu...the one that is supposed to have all sources, binaries, et al.,
and presumably all libs and tools needed for compiling code.  (Someone
clue me in here...I'm new at this so maybe I'm off base.)  I got the new
clean system up to the shell and CVSup'd for SRC-ALL and PORTS-ALL. 
>From there I ran 'make all install clean distclean' under XFree86-4 to
compile X.  The first time I had only CVSup'd for PORTS-ALL and it
looked to the Internet to download the source.  It errored out with a
slew of messages such as these:

/usr/include/sys/cdefs.h:273: warning: '_POSIX_C_SOURCE' is not defined
/usr/include/sys/cdefs.h:279: warning: '_POSIX_C_SOURCE' is not defined

Then it listed an internal compiler error, did a core dump and exited
from its task.  I thought the source it was looking up on the Internet
might be either incomplete or incorrect so I then CVSup'd for SRC-ALL
and tried again.  It started out fine finding the source
locally...looked peachy and then the same thing happened as listed
above.  Same identical messages.  What went wrong?

Help me Obi Wan,
Pat Burnett