anchor.diff:              }" /no-such-path \
             --replace "${stdenv.cc}" /no-such-path \
             --replace "$man" /no-such-path
  -      '' + stdenv.lib.optionalString crossCompiling
  +      '' + optionalString crossCompiling
         ''
           mkdir -p $dev/lib/perl5/cross_perl/${version}
           for dir in cnf/{stub,cpan}; do
  
positive.code: { config, lib, stdenv, fetchurl, pkgs, buildPackages, callPackage
  , enableThreading ? stdenv ? glibc, makeWrapper
  }:
  
  with lib;
  
negative.code:       ++ optional stdenv.isSunOS "-Dcc=gcc"
        ++ optional enableThreading "-Dusethreads";
  
      configureScript = optionalString (!crossCompiling) "${stdenv.shell} ./Configure";
  
      dontAddPrefix = !crossCompiling;
  
  