[Cooker] What rpmrc is used when compiling in Mandriva? manbo or ?

In http://wiki.mandriva.com/en/Development/Howto/RPM you are told to to
add the .rpmmacros configuration file into your home directory. In a
previous version it also said to make a .rpmrc in your home directory.
I also read somewhere that there is a system-wide
/usr/lib/rpm/manbo/rpmrc.
But when compiling a package with e.g. "rpmbuild -ba ktron.spec" what
rpmrc is used: /usr/lib/rpm/rpmrc or /usr/lib/rpm/manbo/rpmrc?

And what does "manbo" mean?

I first posted this question in Mandriva forum but I think that Mandriva developers know more about this subject.

vatbier