ECPG failure on BF member Vaquita (Windows Vista)

I'm seeing an ECPG-Check failure on Windows Vista - any ideas what might
be causing this?

http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=vaquita&dt=2007-04-24%2020:00:05

The only other Vista buildfarm member (baiji, on the same physical box)
is running MSVC builds which don't yet test ECPG from what I can see.

Regards, Dave