anchor.diff:    kvazaar = null;
     ladspa-sdk = null;
     #libavc1394 = null;
  +  libbluray = null;
     libbs2b = null;
     libcaca = null;
     libdc1394 = null;
  
positive.code: 
  gvfs_1-34 = callPackage ../all-pkgs/g/gvfs {
    channel = "1.34";
    libsoup = pkgs.libsoup_2-60;
  };
  gvfs = callPackageAlias "gvfs_1-34" { };
  
negative.code: mpv_generics = overrides: callPackage ../all-pkgs/m/mpv ({
    jack2_lib = null;
    lcms2 = null;
    libbluray = null;
    libbs2b = null;
    libcaca = null;
    mujs = null;
  