Created attachment 321300 [details]
emerge --info '=x11-misc/xmobar-0.14'
With xmobar-0.13 everything work.
Created attachment 321310 [details]
Created attachment 321312 [details]
This problem was due to mtl-1.* usage and currently it solved as mtl-2.* is stable and we have masked mtl-1.*.
Thanks for report and sorry for a delay.