Hmm. Except, maybe, since you seem to be set up to build Cygwin from
CVS, could you start building the 09-12 version from CVS and then just
add one change from CVS at a time using
cvs up -D 'yyyy-mm-dd HH:MM'
as filter until you encounter the problem? An interesting situation to
test would be, if you have the state after this change:
2010-09-12 Corinna Vinschen<...>
* sec_acl.cc (acl_worker): Remove.
(acl32): Implement acl_worker functionality here.
(lacl32): Just return -1 with errno set to ENOSYS.
(lacl): Ditto.
* include/cygwin/acl.h (lacl): Remove this call.
and then just add this single change from the first 2010-09-13 checkin:
* fhandler_tty.cc (fhandler_tty_slave::init): Use tty::setpgid method.