`wlfreerdp` no longer compiles on FreeRDP versions higher than 3. Running `equery u freerdp` shows the wayland flag as missing. Although, if you inspect the ebuilds for freerdp 3 and up, the wayland USE flag still seems to be defined; no idea why it stopped showing up.
Please see bug 930197 and the mask message. *** This bug has been marked as a duplicate of bug 930197 ***