> Now, when I do:
 > 
 > peter@peter.noc.demon.net $ cpp -dM < /dev/null
 > #define __GCC_NEW_VARARGS__ 1
 > #define __NetBSD__ 1
 > #define sparc 1
 > #define __GNUC__ 1
 > #define unix 1
 > 
 > I see no __STDC__ defined. What am I missing here (ie where would __STDC__
 > be defined) or are all the source files really being compiled (in userland
 > at least) without prototypes for the standard libraries ?

Actually __STDC__ *is* defined, unless you use -traditional, even if it
is not reflected in -dM output.  This is probably a bug or misfeature
in the -dM handling in cpp.

  -  Arne H. J.