A newer version of 0install exists. Renaming the ebuild works pretty well for me. Reproducible: Always
Version 0.37 is available now, renaming ebuild works. >=0.35 is required to run the Crystalspace3d engine version of Yo Frankie!: http://www.yofrankie.org/available-for-testing-windows-packages-cs-edition/
0.38 is also available, and compiles + installs + runs fine when using the 0.33 ebuild from portage, simply renamed. Tested on AMD64.
Okay, I've been putting this off for a while, but actually got zeroinstall-injector-0.40 in the tree!