I have a fisheye lens (Samyang 7.5mm full-frame fisheye connected to a Panasonic G5). I'm running self-compiled ufraw from cvs with enabled lensfun and gimp 2.6.11.
If I select 'fisheye' as Lens geometry and, e.g., 'Panoramic' as target geometry, the displayed image is correctly destretched, and if I save the file from ufraw I get this properly destretched image, too. But if I use the send-to-gimp button this destretching is ignored/skipped and I get the fisheye image (with a wrong crop).