Comment 3 for bug 136356

I've sent a bug report upstream: http://trac.mulberrymail.com/mulberry/ticket/334

However, there are some information on how to build mulberry:
http://trac.mulberrymail.com/mulberry/wiki/opensource

I also noticed that there is a Freebsd port, maybe their Makefile could be used as a template to fix up the Makefile:
http://www.freshports.org/mail/mulberry/
http://www.freebsd.org/cgi/cvsweb.cgi/ports/mail/mulberry/

:)