anchor.diff: -{ lib, stdenv, fetchurl
  +{ lib, stdenv, fetchurl, makeWrapper
   , pkg-config, intltool
   , perl, gettext, libX11, libXext, libXi, libXt
   , libXft, libXinerama, libXrandr, libXxf86vm, libGL, libGLU, gle
   , gtk2, gdk-pixbuf, gdk-pixbuf-xlib, libxml2, pam
  -, systemd
  +, systemd, coreutils
   , forceInstallAllHacks ? false
   , withSystemd ? stdenv.isLinux
   }:
  
positive.code:   };
  
    nativeBuildInputs = [
      pkg-config intltool
    ];
  
    buildInputs = [
  
negative.code:     "--with-app-defaults=${placeholder "out"}/share/xscreensaver/app-defaults"
    ];
  
    postInstall = ''
      for bin in $out/bin/*; do
        wrapProgram "$bin" \
          --prefix PATH : "$out/libexec/xscreensaver" \
          --prefix PATH : "${lib.makeBinPath [ coreutils ]}"
      done
    '' + lib.optionalString forceInstallAllHacks ''
      make -j$NIX_BUILD_CORES -C hacks/glx dnalogo
      cat hacks/Makefile.in \
        | grep -E '([a-z0-9]+):[[:space:]]*\1[.]o' | cut -d : -f 1 | xargs make -j$NIX_BUILD_CORES -C hacks
  