(Sorry for duplicating this, which I also replied to the patch e-mail)

Now it fails here:

Loading d:/Devel/emacs/repo/trunk/lisp/loaddefs.el (source)...
Loading d:/Devel/emacs/repo/trunk/lisp/ldefs-boot.el (source)...
Testing file: Permission denied, d:/var/mail
make[1]: *** [Makefile:817: bootstrap-emacs.pdmp] Error 127
make: *** [Makefile:424: src] Error 2