I have created a bugreport for this on b.k.o (http://bugs.kde.org/show_bug.cgi?id=132582). Thanks to Gilles Caulier and Andreas Huggel this was fixed quickly in subversion of Exiv2. To avoid that ~ users of digiKam/Exiv2 can't use digiKam anymore until a new version of Exiv2 has been released I would like to make a request that this patch can be applied to Exiv2-0.10. Thanks!
Created attachment 94560 [details, diff]
Patch to fix crash
Created attachment 94561 [details, diff]
patch for the ebuild
Created attachment 94562 [details]
ok, I make a new revision.
new revision in CVS.
Thanks for the quick response and implementation. It works great, digiKam doesn't crash anymore.