anchor.diff:    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_BASH_COMPLETION_COMPLETIONSDIR = "${placeholder "out"}/share/bash-completion/completions";
     PKG_CONFIG_UDEV_UDEVDIR = "${placeholder "out"}/lib/udev";
   
     passthru = {
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "colord";
    version = "1.4.5";
  
    outputs = [ "out" "dev" "devdoc" "man" "installedTests" ];
  
    src = fetchurl {
      url = "https://www.freedesktop.org/software/colord/releases/${pname}-${version}.tar.xz";
      sha256 = "05sydi6qqqx1rrqwnga1vbg9srkf89wdcfw5w4p4m7r37m2flx5p";
    };
  
    patches = [
  
negative.code: { lib
  , stdenv
  , fetchurl
  , nixosTests
  , bash-completion
  