anchor.diff:      "--with-libevent=${libevent.dev}"
       "--with-protobuf=${pythonProtobuf.protobuf}"
       "PROTOBUF_JAR=${mavenRepo}/com/google/protobuf/protobuf-java/3.3.0/protobuf-java-3.3.0.jar"
  +    (if withJava then "--enable-java" else "--disable-java")
     ] ++ lib.optionals stdenv.isLinux [
       "--with-network-isolator"
       "--with-nl=${libnl.dev}"
  
positive.code:       --old-and-unmanageable \
        --prefix="$out"
      popd
    '';
  
    postFixup = ''
  
negative.code:   postInstall = ''
      rm -rf $out/var
      rm $out/bin/*.sh
  
      # Inspired by: pkgs/development/python-modules/generic/default.nix
      pushd src/python
  