I tried installing git on the N900 and also get the error seen above and the clone command fails:

~/git$ git clone ssh://dov@myserver/home/dov/repos
warning: templates not found /home/builder3/maemo-fremantle-armel-extras-devel/work/git-1.6.5.7/debian/git/usr/share/git-core/templates
Initialized empty Git repository in /home/user/git/repos/.git/
dov@myserver's password:
git: 'index-pack' is not a git-command. See 'git --help'.
fatal: index-pack failed
~/git$ remote: Counting objects: 1283, done.

any ideas?