anchor.diff:      use_system_v8 = false;
     } // optionalAttrs (post24 && !post25) {
       use_system_libvpx = true;
  +    use_system_protobuf = true;
     };
   
     defaultDependencies = [
  
positive.code: # dependencies for v25
  , libvpx
  
  # dependencies for >= v26
  , protobuf, speechd, libXdamage
  
  # optional dependencies
  , libgcrypt ? null # gnomeSupport || cupsSupport
  
negative.code:   post24 = !versionOlder sourceInfo.version "25.0.0.0";
    post25 = !versionOlder sourceInfo.version "26.0.0.0";
    only24 = post23 && !post24;
    only25 = post24 && !post25;
  
    maybeFixPulseAudioBuild = optional (only24 && pulseSupport)
      ./pulse_audio_fix.patch;
  