anchor.diff:      use_system_v8 = false;
     } // optionalAttrs (post24 && !post25) {
       use_system_libvpx = true;
  +    use_system_protobuf = true;
     };
   
     defaultDependencies = [
  
positive.code:     ++ optional enableSELinux libselinux
      ++ optional cupsSupport libgcrypt
      ++ optional pulseSupport pulseaudio
      ++ optional post24 pciutils
      ++ optional (post24 && !post25) libvpx
      ++ optionals post25 [ protobuf speechd libXdamage ];
  
    opensslPatches = optional useOpenSSL openssl.patches;
  
  
negative.code: # dependencies for v25
  , libvpx
  
  # dependencies for >= v25
  , protobuf
  
  # dependencies for >= v26
  , speechd, libXdamage
  
  # optional dependencies
  , libgcrypt ? null # gnomeSupport || cupsSupport
  