The ebuild in portage has a wrong dependency for dev-cpp/libxmlpp. assogiate does not depend on v. 2.14 but on 2.6. 2.14 is not stable, but 2.12 and 2.13 are. Solution: Change dependency for dev-cpp/libxmlpp from 2.14 to 2.12 (or possibly just to 2.6 though only 2.12 and forward are available in portage in the 2.6 slot). Please take a look at the ebuild at http://www.kdau.com/files/assogiate-0.2.1.ebuild (ebuild from developer)
Created attachment 136648 [details] Modified ebuild for assogiate-0.2.1
<dev-cpp/libxmlpp-2.14 produces buggy behaviour with this package plus there's absolutely nothing wrong w/ unstable ebuild depending on unstable lib.