There's always the option of having a "strict ANSI" vs an "ANSI +
extensions" mode..

HPUX uses -Ac for "K&R mode", -Aa for "ANSI mode" and -Ae for
"extended ANSI" mode; these (among other things) change some of the
initial CPP defines which change what's visible in the system header
files.

GCC already has a `-ansi' option; we could key off of that to detect
when to go into bondage-and-discipline mode in the system headers..

				- Bill