>        Is it possible to do any compiling at all on a 4MB system?  (At
>the very least, is it possible to rebuild the kernel in 4MB ?)  (I have
>an old machine I don't feel like putting any more $ into)

Building the GENERIC kernel needs 4122KB that is 4.03MB.
Close miss...
(Assuming that you allready have got the 31MB /usr/src/sys tree
But i think you don't need all the arch/* subdirectories. You
probably just have to keep the mac68k and m68k ones and save a
lot of disk space.)

-- Francois Pays