anchor.diff:        system. Application windows can be managed by keyboard and mouse. Windows
         can be iconified to the taskbar, to the tray, to the desktop or be made
         hidden. They are controllable by a quick switch window (Alt+Tab) and in a
  -      window list. A handful of configurable focus models are
  -      menu-selectable. Setups with multiple monitors are supported by RandR and
  -      Xinerama. IceWM is very configurable, themeable and well documented. It
  -      includes an optional external background wallpaper manager with
  -      transparency support, a simple session manager and a system tray.
  +      window list. A handful of configurable focus models are menu-selectable.
  +      Setups with multiple monitors are supported by RandR and Xinerama. IceWM
  +      is very configurable, themeable and well documented. It includes an
  +      optional external background wallpaper manager with transparency support,
  +      a simple session manager and a system tray.
       '';
       license = licenses.lgpl2Only;
       maintainers = [ maintainers.AndersonTorres ];
  
positive.code:     perl
      pkg-config
    ];
    buildInputs = [
      expat
      fontconfig
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "icewm";
    version = "2.9.6";
  
    src = fetchFromGitHub {
      owner = "ice-wm";
      repo = pname;
      rev = version;
      hash = "sha256-qC8gEVJ/cmsEbF8jMzv7zyvVcjlbXhgHU3ixe7RLcnA=";
    };
  
    nativeBuildInputs = [
  