anchor.diff:    ];
   
     preBuild = ''
  -    grep -r '/usr/sbin/nscd' .
  +    grep -q '/usr/sbin/nscd' lib/nscd.c
       sed -i 's,/usr/sbin/nscd,/run/current-system/sw/bin/nscd,g' lib/nscd.c
  +    ! grep -r '/usr/sbin/ncsd' .
     '';
   
     preInstall = ''
  
positive.code: }:
  
  let
    version = "4.5";
  in
  stdenv.mkDerivation rec {
    name = "shadow-${version}";
  
negative.code:   src = fetchurl {
      url = "https://github.com/shadow-maint/shadow/releases/download/${version}/${name}.tar.xz";
      hashOutput = false;
      sha256 = "0998c8d84242a231ab0acb7f8613927ff5bcff095f8aa6b79478893a03f05583";
    };
  
    buildInputs = [
  