How to run
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Checkout: https://svn.erp5.org/repos/public/erp5/trunk/utils/rpmgen

For example:
  svn co https://svn.erp5.org/repos/public/erp5/trunk/utils/rpmgen ~/rpmgen

  Run make inside:
  $ cd ~/rpmgen
  $ make <distribution name> # mandriva, opensuse, fedora or centos

The rpm will be created at:
  ~/rpmbuild/RPMS/<arch>/

Tips
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Using ccache is highly recommended.
http://ccache.samba.org/