rpmrebuild is a tool to build an RPM file from a package that has already been installed. It can be used to easily build modified packages, and works on any Linux distribution that uses RPM.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
The spec file was fixed to work on current Linux distributions such as Mandriva 2007. Temporary directories were changed to allow concurrent use. An optional bug report (by mail) was added to allow new problems to be debugged.