anchor.diff:  { stdenv
   , fetchTritonPatch
   , fetchurl
  -
  -, enableThreading ? true
   }:
   
   let
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "059b3cb69970d8c8c5964caced0335b4af34ac990c8e61f7e3f90cd1c2d11e49";
    };
  
    setupHook = ./setup-hook.sh;
  
    patches = [
      # Do not look in /usr etc. for dependencies.
  
negative.code:     })
    ];
  
    postPatch = ''
      sed -i "/my \$pwd_cmd;/s,;, = '/bin/sh -c pwd';," dist/PathTools/Cwd.pm
    '';
  
    # Build a thread-safe Perl with a dynamic libperls.o.  We need the
    # "installstyle" option to ensure that modules are put under
    # $out/lib/perl5 - this is the general default, but because $out
  