Mock and the [groups] files

[John Villalovos]

I am looking for documentation on how to create the directory
structure that the [groups] entry point to when using Mock? I would
like to use Mock to build some packages for CentOS 4.4 but I am unsure
on how to create the files that the [groups] entry points to.

So in the one for Fedora Core 5 I see:
buildroots.xml
buildsys-macros-5-2.fc5.noarch.rpm
buildsys-build-0.5-1.noarch.rpm
buildsys-macros-5-2.fc5.src.rpm
buildsys-build-0.5-3.fc5.noarch.rpm
repodata/


I found the spec file to create a buildsys-build rpm.  Though not sure
if it is as simple as doing an rpmbuild -ba buildsys-build.spec, while
running on CentOS 4.4

But after that I am kind of lost.

Thanks for any info,
John