anchor.diff:    # https://github.com/tectonic-typesetting/tectonic/releases/tag/tectonic%400.7.0
     postInstall = ''
       wrapProgram $out/bin/tectonic \
  -      --prefix PATH "${lib.getBin biber}/bin"
  +      --prefix PATH : "${lib.getBin biber}/bin"
     '' + lib.optionalString stdenv.isLinux ''
       substituteInPlace dist/appimage/tectonic.desktop \
         --replace Exec=tectonic Exec=$out/bin/tectonic
  
positive.code: , harfbuzz
  , openssl
  , pkg-config
  , makeWrapper
  , biber
  , icu
  }:
  
negative.code: 
    cargoSha256 = "awDVjJLwgpSMbwptmLhczaxB5HqvsdvEOUsLYb/zTUc=";
  
    nativeBuildInputs = [ pkg-config makeBinaryWrapper ];
  
    buildInputs = [ icu fontconfig harfbuzz openssl ]
      ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ ApplicationServices Cocoa Foundation ]);
  