anchor.diff:      xorg.libXxf86vm
       wayland
       wayland-protocols
  +    xorgproto
       zlib
     ] ++ optionals (buildConfig != "opengl-dummy") [
       elfutils
  
positive.code:   ];
  
    buildInputs = [
      dri2proto
      dri3proto
      expat
      glproto
      libdrm
      libx11
      libxcb
  
negative.code: , lib
  , python2Packages
  
  , elfutils
  , expat
  , libclc
  , libdrm
  , libffi
  