See the tracker for explanation
I just found out there exist 'noltdl'-tarballs for elektra-0.7... anyway I don't think anything in tree requires app-admin/elektra-0.7.1-r5 anymore, it would be best to move on to >=elektra-0.8. <elektra-0.8 requires libtool >=elektra-0.8 does only require libltdl
commit a1859f2e1780848cd96a8b1a8229244e7e7511e8 Author: Lars Wendler <polynomial-c@gentoo.org> Date: Fri Dec 9 15:36:50 2016 app-admin/elektra: Removed old. Package-Manager: portage-2.3.3 =app-admin/elektra-0.7.1-r5 has been removed.