due to some changes by the Sourceforge staff, the address for the Git repo has
changed slightly (they support multiple Git repositories per project now). To
fetch developer snapshots, use
git clone git://lmms.git.sourceforge.net/gitroot/lmms/lmms
from now on (the additional "/lmms" at the end of the URL is new).
Existing local repositories can be adjusted easily: open .git/config and
search for the Git URL (should be in the '[remote "origin"]' section) and
simply append "/lmms" at the end. That's it.