> And the feeping creaturism starts to try to accomodate automatic  
> detection for
> a functionality that isn't needed or used by rpmbuild itself.

Feel free to revert... It was just that proyvind's original
implementation returned RPM_BUILD_NCPUS = "undefined" here. :-)

> And what happens in a VM, that sometimes has one and sometimes several
> cpus's configured at run time?

Then make will be badly configured, and it's even worse
when using OS-level virtualization - as I have found out.

--anders