anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "colord";
  -  version = "1.4.5";
  +  version = "1.4.6";
   
     outputs = [ "out" "dev" "devdoc" "man" "installedTests" ];
   
     src = fetchurl {
       url = "https://www.freedesktop.org/software/colord/releases/${pname}-${version}.tar.xz";
  -    sha256 = "05sydi6qqqx1rrqwnga1vbg9srkf89wdcfw5w4p4m7r37m2flx5p";
  +    sha256 = "dAdjGie/5dG2cueuQndwAcEF2GC3tzkig8jGMA3ojm8=";
     };
   
     patches = [
  
positive.code:   PKG_CONFIG_SYSTEMD_SYSTEMDSYSTEMUNITDIR = "${placeholder "out"}/lib/systemd/system";
    PKG_CONFIG_SYSTEMD_SYSTEMDUSERUNITDIR = "${placeholder "out"}/lib/systemd/user";
    PKG_CONFIG_SYSTEMD_TMPFILESDIR = "${placeholder "out"}/lib/tmpfiles.d";
    PKG_CONFIG_BASH_COMPLETION_COMPLETIONSDIR= "${placeholder "out"}/share/bash-completion/completions";
    PKG_CONFIG_UDEV_UDEVDIR = "${placeholder "out"}/lib/udev";
  
    passthru = {
  
negative.code: { lib
  , stdenv
  , fetchurl
  , nixosTests
  , bash-completion
  