anchor.diff: -{ stdenv, fetchFromGitHub, buildPerlPackage, autoreconfHook, makeWrapper
  +{ stdenv, fetchFromGitHub, fetchurl, buildPerlPackage, autoreconfHook, makeWrapper
   , perl, NetSNMP, coreutils, gnused, gnugrep }:
   
   let
  -  owner = "lausser";
  -
     glplugin = fetchFromGitHub {
  +    owner = "lausser";
       repo   = "GLPlugin";
  -    rev    = "b92a261ca4bf84e5b20d3025cc9a31ade03c474b";
  -    sha256 = "0kflnmpjmklq8fy2vf2h8qyvaiznymdi09z2h5qscrfi51xc9gmh";
  -    inherit owner;
  +    rev    = "e8e1a2907a54435c932b3e6c584ba1d679754849";
  +    sha256 = "0wb55a9pmgbilfffx0wkiikg9830qd66j635ypczqp4basslpq5b";
     };
   
  -  generic = { pname, version, rev, sha256, description, ... } @ attrs:
  +  generic = { pname, version, sha256, description, ... } @ attrs:
     let
       attrs' = builtins.removeAttrs attrs [ "pname" "version" "rev" "sha256"];
  +    name' = "${stdenv.lib.replaceStrings [ "-" ] [ "_" ] "${pname}"}-${version}";
     in perl.stdenv.mkDerivation rec {
  -    name = stdenv.lib.replaceStrings [ "-" ] [ "_" ] "${pname}-${version}";
  +    name = "${pname}-${version}";
   
  -    src = fetchFromGitHub {
  -      repo   = pname;
  -      inherit owner rev sha256;
  +    src = fetchurl {
  +      url = "https://labs.consol.de/assets/downloads/nagios/${name'}.tar.gz";
  +      inherit sha256;
       };
   
       buildInputs = [ perl NetSNMP ];
  
positive.code: in {
    check-nwc-health = generic {
      pname       = "check_nwc_health";
      version     = "20170804";
      rev         = "e959b412b5cf027c82a446668e026214fdcf8df3";
      sha256      = "11l74xw62g15rqrbf9ff2bfd5iw159gwhhgbkxwdqi8sp9j6navk";
      description = "Check plugin for network equipment.";
    };
  
    check-ups-health = generic {
      pname       = "check_ups_health";
      version     = "20170804";
      rev         = "32a8a359ea46ec0d6f3b7aea19ddedaad63b04b9";
      sha256      = "05na48dxfxrg0i9185j1ck2795p0rw1zwcs8ra0f14cm0qw0lp4l";
      description = "Check plugin for UPSs.";
    };
  }
  
negative.code:     nativeBuildInputs = [ autoreconfHook makeWrapper ];
  
      prePatch = with stdenv.lib; ''
        rm -rf GLPlugin
        ln -s ${glplugin} GLPlugin
        substituteInPlace plugins-scripts/Makefile.am \
          --replace /bin/cat  ${getBin coreutils}/bin/cat \
          --replace /bin/echo ${getBin coreutils}/bin/echo \
  