minimum hard-drive space to compile patches?

[Douglas A. Tutty]

I currently have OBSD running on my P-II with an 850 MB drive and 64 MB
ram.  On install, I chose not to include the compiler set over concern
re drive space.  The FAQ says how much space is required to minimally
run OBSD and it says how much to be able to comfortably compile ("4G is
not a bad size").

It may not be "bad" but what is the absolute minimum size of hard drive
for an i386 to be able to recompile any necessary patches itself?

Thanks,

Doug.