IpcMemoryDetach fails under Cygwin on Win98

I'm frantically trying to get PostgreSQL 7.0.3 installed on my laptop so
I can work on my database while on holiday next week. I've got it to
compile fine with the latest version of Cygwin, with cygipc-1.08,
however, when I start postmaster, it fails:

$ ipc-daemon &
$ postmaster -i &
[2] 528923
$ G:\CYGW\USR\LOCAL\PGSQL\BIN\POSTGRES.EXE: *** recreate_mmaps_after_for
k_failed
Startup failed - abort
NOTICE:  IpcMemoryDetach: shmdt(0x0x82f6a000): Invalid argument
NOTICE:  IpcMemoryDetach: shmdt(0x0x86ba1000): Invalid argument
NOTICE:  IpcMemoryDetach: shmdt(0x0x82c50000): Invalid argument

I have applied the patch indicated in a previous thread for cygipc, but
the error still persists. I also tried version 1.07.

I note from the mailing list that someone has had PostgreSQL working
under Win98 before - I would be extremely grateful if someone could help
me get this working.

[ I can't seem to get gdb to work properly under Cygwin (would not find
the source files), so I was unable to step through the code and see what
the problem is. ]

Thanks!
--
Jamie Walker              "My dear boy, forget about the motivation.
jamie@sagaxis.co.uk        Just say the lines and don't trip over the
http://www.sagaxis.co.uk/  furniture."  (Noel Coward)