Another gcc34 question

[walt]

I've noticed that some (maybe all?) kde ports don't compile
with gcc34 -- as far as I can tell because this test in
/usr/X11/include/qglobal.h fails:
#elif defined(__FreeBSD__) || defined(__DragonFly__)
Now, when I grep thru the headers in /usr/include I find
many places where the very same test is used.
First -- I'm wondering if by using gcc34 to build world/kernel
all of those tests fail, just like the test fails for kde ports?
Second -- where are those variables defined?  The only place I've
found the definitions is in dragonfly.h in the gcc2 sources directory.
Is this why gcc2 works and gcc34 doesn't work for kde?
Thanks for any clues.