After switching to xorg-x11-7.0-r1 I needed xvkbd, but it would not compile, because it depends on rman and gccmakedep which were not compiled within xorg-x11 package. I think the x11-misc/xvkbd ebuild should reflect its dependency on these packages (app-text/rman & x11-misc/gccmakedep).
Fixed, thanks.