[mythtv] Packaging from tarball - version

[Craig Treleaven]

Hi:

I'm working on a build process using tarballs and ending up with 
incomplete version info.  Eg:
$ mythtv-setup --version
Please attach all output as a file in bug reports.
MythTV Version : v0.25
MythTV Branch :
Network Protocol : 72
Library API : 0.25.20120506-1
QT Version : 4.8.1
Options compiled in:
  release use_hidesyms darwin_da using_corevideo using_backend [blah blah]


I see that /mytht/version.sh and /mythtv/external/FFmpeg/version.sh 
are called and fail as  the git info they want doesn't exist.

What do other packagers do?  Could someone point to an example?

Thanks,

Craig