There are no xroach ebuilds.
Debian, FreeBSD and RedHat have xroach as separate package (found by google).
If bug 48048 is caused by missing dependencies, I'd rather install xroach then groach.
Steps to Reproduce:
1. emerge search xroach
[ Results for search key : xroach ]
[ Applications found : 0 ]
Found some ebuild ...
I hope it's not some case like "xroach is included in .... which is absolutely
clear" because I don't think it's clear. Debian, FreeBSD and RedHat have it as
separate package (found by google).
xroach is not currently developed and last Debian release including this package was Potato, even its home page is dead.
AFAIK groach had the same goal but it is not developed as well.
Devs, please close this bug.
Sounds like a plan.