anchor.diff:  , libxdamage
   , libxext
   , libxfixes
  +, libxinerama
   , libxkbcommon
  +, libxrandr
  +, libxrender
   , mesa_noglu
   , pango
   , rest
  
positive.code:     "--disable-debug"
      "--disable-installed-tests"
      "--${boolEn (libxkbcommon != null)}-xkb"
      "--${boolEn (xorg != null)}-xinerama"
      "--${boolEn (xorg != null)}-xrandr"
      "--${boolEn (libxfixes != null)}-xfixes"
      "--${boolEn (libxcomposite != null)}-xcomposite"
      "--${boolEn (libxdamage != null)}-xdamage"
  
negative.code: 
  assert libx11 != null ->
    xorg.libXcursor != null
    && xorg.libXi != null;
  
  let
    inherit (lib)
  