The GTK+ 3 Rawtherapee which is in upstream Debian has a build-dependency on GTK+ 3 >= 3.16, and we have only 3.14 in Jessie. However, Rawtherapee has an alternative source download that will use GTK+ 2 libraries that we do have available, and so I set up a build repository for that source on the openSUSE Build Service.
Instructions for adding the repo---the commands for adding the key must also be run as root: https://software.opensuse.org/download. ... awtherapee