pg_regress breaks on msys

pg_regress now seems to break on Msys virtual locations:

Example from the buildfarm: http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=snake&dt=2006-07-19%2009:00:00


================== pgsql.4660/src/test/regress/log/initdb.log ===================
The filename, directory name, or volume label syntax is incorrect.


Surely this was tested when the original was prepared?

cheers

andrew