C-4. Dist tag
------------- In cases where the same SRPM and patchlevel is used between two or more distributions supported by Fedora, a dist tag is appended to the end of the release tag defined in C-2 and C-3. The dist tags with the following examples appear to be only cosmetic, however the a different E-V-R is needed between distributions to ensure dist upgrading works fully in all corner cases.
Dist Tag for Normal Packages: %{X}.%{disttag}
Example:
foobar-1.2.3-1_0.7.3.i386.rpm