The last stable release of digiKam is 4.9.0: https://www.digikam.org/node/735 http://download.kde.org/stable/digikam/ At the moment, the portage tree only has 4.4.0-r1 ~4.6.0 and ~4.7.0. Please bump.
For those impatient, I've managed to merge and run digiKam 4.9.0 by copying the ebuild for 4.7.0 and changing the following: -SRC_URI="mirror://kde/stable/${PN}/${MY_P}-1.tar.bz2" +SRC_URI="mirror://kde/stable/${PN}/${MY_P}.tar.bz2" I give no guarantees thou.
There's some ebuilds in the KDE overlay now.
digikam-4.10.0 is out.
Created attachment 403244 [details] digikam-4.10.0 ebuild
The attached ebuild works fine for me on amd64 with GCC-4.9.2 in Plasma 5 using kde-apps where available.
All done.