I guess the situation for Fedora is pretty simple:
- Fedora releases every 6-9 months and supports a release N approximately
  for 1-2 months after the N+2 release is out.
  Generally Fedora ships the latest versions and we don't have any issues
  with old dependencies.

- RHEL/CentOS is a bit more tricky:
   - RHEL 5 is supported (as in "end of production 3") until 2017
       - Python 2.4
       - subversion 1.6.11
   - RHEL 6 support ends 2020
       - Python 2.6
       - subversion 1.6.11
   - RHEL 7 should be good until 2024
       - Python 2.7
       - subversion 1.7.14

>From what I can see there is very little active maintenance anymore for
packages in Fedora EPEL 5 (add-ons for RHEL/CentOS 5) which means that most
people running these versions are just satisfied with the status quo, not much
need for newer versions (in which case they'll likely just upgrade).
Most web hosts also upgraded at least to RHEL 6 also to provide newer versions
of PHP.

Maybe as a general rule most people stop caring about new features for a
RHEL/CentOS release about 7 years after the initial introduction which means
"end of production 2" (Red Hat provides maintenance updates only from that
point on).

For RHEL 6 that means people likely care about that release until 2017.

That being said personally I'd not veto a change like you proposed ("support
the most recent LTS release with each major release of Trac, provided the LTS
release has been out for a while, say 6 months") if it makes life easier.

For Fedora EPEL we're in a mess anyhow because:
 - Trac 1.1 is guaranteed to be compatible
 - EPEL does not have a deprecation policy so we could introduce major
   version upgrades in a well-understood way which does not catch EPEL users
   by surprise.

Felix

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