I ran in trouble during my last emerge -auDN @world The error message I got during the compilation of mesa-18.2.0_rc2  is Meson encountered an error in file meson.build, line 593, column 4: Problem encountered: XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga. That is the first time that I see this error message. Everything works fine regarding mesa until now.... I have a good working nvidia card and regarding original