anchor.diff:  
   assert libx11 != null ->
     xorg.libXcursor != null
  -  && xorg.libXi != null
  -  && xorg.libXinerama != null
  -  && xorg.libXrandr != null
  -  && xorg.libXrender != null;
  +  && xorg.libXi != null;
   
   let
     inherit (lib)
  
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: , libxdamage
  , libxext
  , libxfixes
  , libxinerama
  , libxkbcommon
  , libxrandr
  , libxrender
  , mesa_noglu
  , pango
  , rest
  