There have been some changes in the KDE svn repository, as of now all extragear applications for KDE 3 have been moved from trunk/extragear to branches/extragear/kde3 . Only KDE 4 apps are now in trunk/extragear.

This means that ktorrent can now be found under the following path :

branches/extragear/kde3/network/ktorrent

So anybody using the SVN version will need to checkout a fresh copy with this path.