mingw initdb failure on HEAD

Several buildfarm mingw members are getting failures like this, when
running initdb:

creating conversions ... FATAL: could not load library "C:/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.3584/src/test/regress/./tmp_check/install/home/pgrunner/bf/root/HEAD/inst/lib/postgresql/utf8_and_johab.dll": Invalid access to memory location.

STATEMENT: CREATE OR REPLACE FUNCTION johab_to_utf8 (INTEGER, INTEGER, CSTRING, INTERNAL, INTEGER) RETURNS VOID AS '$libdir/utf8_and_johab', 'johab_to_utf8' LANGUAGE C STRICT;

child process exited with exit code 1

See for example
<http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=dawn_bat&dt=2010-05-27%2019:45:18>

Could it have been caused by the PGDLLIMPORT/PGDLLEXPORT changes?

cheers

andrew