= Development rpm =
It may be possible that the [http://download.fedora.redhat.com/pub/fedora/linux/extras/development/testing rpm] works on the current core version of Fedora. For example, the fc7 rpm will run on fc6, with a few small issues. This usually works, but it is not a supported method, ie: if it breaks the error may not be with gramps or the fedora build, but with the differences between fedora versions. In other words you're on your own with trouble shooting, and if you do report a bug then be sure that it isn't to do with the version mismatch - don't confuse the developers/builders with introduced problems (one's outside their control).
Assuming you have an existing version of gramps installed, then to install the development rpm for fc6...