I will attach screeenshot Reproducible: Always Steps to Reproduce: 1.urxvt
Created attachment 200128 [details] screenshot of bug
Created attachment 200129 [details] emerge --info
That looks like a font (so configuration) problem, not a real bug. Are you sure you have the required fonts ?
No I am not shure. How can I check? Long time ago (xserver 1.3) it just worked for me.
Read http://www.gentoo-wiki.info/Rxvt-unicode and http://en.gentoo-wiki.com/wiki/Rxvt-Unicode then look at your ~/.Xdefaults file. If you still have this issue, reopen the bug.