Extracted from http://www.dragonflybsd.org/hammer/index.shtml:
"If you are interesting in porting HAMMER to another OS, please drop me a line at dillon at backplane.com. I will be creating a new DragonFly mailing list specifically for HAMMER porting as well as a git or mercurial repository (I haven't decided which yet) separate from the DragonFly repository. "
-- Thanks, Jordi Espasa Clofent
