anchor.diff:  , libwebp
   , openexr
   , pango
  -, v4l_lib
  +#, v4l_lib
   , vala
   }:
   
  
positive.code:     libwebp
      openexr
      pango
      v4l_lib
      vala
    ];
  
  
negative.code:     "--without-lua"
      "--without-libspiro"
      "--without-umfpack"
      "--without-libv4l"  # This is currently broken
    ];
  
    meta = with stdenv.lib; {
  