specfile

You want to make those packages conflict with each other, so that yum knows that they cannot be installed simultaneously. %package one Summary: Summary for foo-one Group: %{group} Obsoletes: %{name} <= %{version} Provides: %{name} = %{version} Conflicts: %{name}-two

The Fedora Project hosts the best documentation on RPM out there in html format: http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/html-single/RPM_Guide/index.html See also: http://fedoraproject.org/wiki/How_to_create_an_RPM_package Prior to these resources, my go to guide was Maximum RPM (which you also found): http://www.rpm.org/