There is a repository for maintenance of boehm gc for the Hurd's needs:
grubber:~tschwinge/tmp/boehm-gc/git.
This repository uses TopGit and is a git cvsimport of the SourceForge CVS
repository.
git \
cvsimport \
-d :pserver:anonymous@bdwgc.cvs.sourceforge.net:/cvsroot/bdwgc \
-r upstream \
-k \
bdwgc