anchor.diff:  { lib, stdenv
   , fetchurl
  +, buildPackages
   , pkg-config
   , glib
   , gpm
  
positive.code:     sha256 = "sha256-6ZTZvppxcumsSkrWIQeSH2qjEuZosFbf5bi867r1OAM=";
    };
  
    nativeBuildInputs = [ pkg-config autoreconfHook unzip ]
      # The preFixup hook rewrites the binary, which invaliates the code
      # signature. Add the fixup hook to sign the output.
  
negative.code: 
    enableParallelBuilding = true;
  
    configureFlags = [
      # used for vfs helpers at run time:
      "PERL=${perl}/bin/perl"
      # used for .hlp generation at build time:
      "PERL_FOR_BUILD=${buildPackages.perl}/bin/perl"
    ];
  
    postPatch = ''
      substituteInPlace src/filemanager/ext.c \
  