Building OpenBSD for different architectures from a common NFS exported source tree

[Marc Balmer <marc_(_at_)_msys_(_dot_)_ch>]

Hi all

I was checking google to find out if it was possible to build OpenBSD 
for various architectures from a common, NFS exported source tree.  No 
real results, however.

I have set-up an i386, a macppc and a sparc server here, the macppc 
exports /usr/src to the others, but apparently a make build 
changes/creates files within /usr/src (as a precaution I mounted 
/usr/src read only on the other machines).  So a parallel build seems 
not work (even make obj fails on a ro filesystem).

Is this possible at all?  Keeping one machine sync with CVS and then 
recompile for different architectures in parallel?

Regards,
Marc