anchor.diff:      "--enable-nls"
       "--disable-strict"
       "--enable-rpath"
  -    (enFlag "libgusb" (libgusb != null) null)
  -    (enFlag "udev" (systemd_lib != null) null)
  +    "--${boolEn (libgusb != null)}-libgusb"
  +    "--${boolEn (systemd_lib != null)}-udev"
       "--disable-bash-completion"
  -    (enFlag "polkit" (polkit != null) null)
  +    "--${boolEn (polkit != null)}-polkit"
       "--enable-libcolordcompat"
  -    (enFlag "systemd-login" (systemd_lib != null) null)
  +    "--${boolEn (systemd_lib != null)}-systemd-login"
       "--disable-examples"
  -    (enFlag "argyllcms-sensor" (argyllcms != null) null)
  +    "--${boolEn (argyllcms != null)}-argyllcms-sensor"
       "--disable-reverse"
       "--disable-sane"
  -    (enFlag "vala" (vala != null) null)
  +    "--${boolEn (vala != null)}-vala"
       "--disable-session-example"
       "--enable-print-profiles"
       "--disable-installed-tests"
  
positive.code: 
  let
    inherit (stdenv.lib)
      enFlag;
  in
  
  stdenv.mkDerivation rec {
    name = "colord-1.3.2";
  
    src = fetchurl rec {
      url = "https://www.freedesktop.org/software/colord/releases/${name}.tar.xz";
      sha1Url = "${url}.sha1";
      sha256 = "d4ab3f11ec5e98d1079242fda7ad0a84a51da93572405561362a6ce2c274b8f5";
    };
  
    nativeBuildInputs = [
  
negative.code:     cp -v ./data/colormgr $out/etc/bash_completion.d
    '';
  
    passthru = {
      srcVerification = fetchurl rec {
        inherit (src)
          outputHash
          outputHashAlgo
          urls;
        sha1Urls =  map (n: "${n}.sha1") urls;
        pgpsigUrls = map (n: "${n}.asc") urls;
        pgpKeyFingerprint = "163EB 50119 225DB 3DF8F  49EA1 7ACBA 8DFA9 70E17";
        failEarly = true;
      };
    };
  
    meta = with stdenv.lib; {
      description = "Accurately color manage input and output devices";
      homepage = http://www.freedesktop.org/software/colord/intro.html;
  