Fatal 2: control file context is broken

I am runnning postgres 7.1.3 on RH 7.2.  I am using Lyris Listmanager
6.1
I have been running this way for 2 years - no problems!
Today postgres quit.  I am unable to start postgres.  I receive this
error:
[postgres@listman bin]$ ./pg_ctl start
[postgres@listman bin]$ FATAL 2:  control file context is broken
./postmaster: Startup proc 1816 exited with status 512 - abort

I have not been able to find anything in the logs.  Because I have not
had any problems I don't even know where to begin looking.  If this is
the wrong list, please point me to the correct one.  I am looking for
help.  Is there a shop out there that support Postgres?

Thanks

=============================
Michael Brytowski - MAPPCOR
IT Specialist
651-632-8446