The various build environments used to make the rpms in the rpmrepo project. These are all designed to be built on a CentOS 6 installation.
Each directory in the top level (for instance nginxbuild) is its own rpmbuild
environment. To compile the rpms/srpms for a project:
cd /path/to/rpmbuild/nginxbuild
rpmbuild --define "_topdir /path/to/rpmbuild/nginxbuild" -ba SPECS/nginx.spec