http://bugs.winehq.org/show_bug.cgi?id=31057
--- Comment #7 from Dmitry Utkin loentar@gmail.com 2013-05-06 06:42:25 CDT --- Looks like issue is related to Unicode support.
I you convert Makefile to UTF-16 using iconv, nmake works!
iconv -futf-8 -tutf-16 Makefile >Makefile1 mv Makefile Makefile~ mv Makefile1 Makefile
Example of Makefile that is in UTF-16 encoding is in attach.