git-svn 1.5.3 does not understand grafts?

svnadmin create /usr/local/src/TM/svn-tst/7720-svn/
svn mkdir  file:///usr/local/src/TM/svn-tst/7720-svn/trunk -m "Add trunk dir"
svn mkdir  file:///usr/local/src/TM/svn-tst/7720-svn/trunk/swp -m "Add swp dir"

In my git repo I do
git-svn init  file:///usr/local/src/TM/svn-tst/7720-svn/trunk/swp 
git-svn fetch
git branch svn remotes/git-svn
#make remotes/git-svn parent to the initial commit in my git tree
graftid=`git-show-ref -s svn`
echo da783cce390ce013b19f1d308ea6813269c6a6b5 $graftid > .git/info/grafts
#da783... is the initial commit in my git tree.
git-svn dcommit

fails with:
Committing to file:///usr/local/src/TM/svn-tst/7720-svn/trunk/swp ...
Commit da783cce390ce013b19f1d308ea6813269c6a6b5
has no parent commit, and therefore nothing to diff against.
You should be working from a repository originally created by git-svn


 Jocke