anchor.diff:    dbus = attrs: {
       nativeBuildInputs = [ pkg-config ];
       buildInputs = [ dbus ];
  +  };
  +
  +  expat-sys = attrs: {
  +    nativeBuildInputs = [ cmake ];
     };
   
     foundationdb-sys = attrs: {
  
positive.code:     buildInputs = [ dbus ];
    };
  
    nettle-sys = attrs: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ nettle clang ];
  
negative.code:     buildInputs = lib.optional stdenv.isDarwin Security;
    };
  
    servo-fontconfig-sys = attrs: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ freetype ];
    };
  
    skia-bindings = attrs: {
      nativeBuildInputs = [ python2 ];
    };
  
    thrussh-libsodium = attrs: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ libsodium ];
  