app-crypt/trousers is two years out of date in the tree. Reproducible: Always
Created attachment 400780 [details] app-crypt/trousers-0.3.13.ebuild ebuild of trousers-0.3.10 just adapted to changed patch
Created attachment 400782 [details, diff] files/trousers-0.3.13-nouseradd.patch adapted patch
Thanks! Next time, if it is only a patch just attach patch... and if you attach ebuild please attach diff for the ebuild.