anchor.diff:  { stdenv, fetchgit, xorg
   , autoconf, automake, cvs, libtool, nasm, pixman, xkeyboard_config
   , fontDirectories, libgcrypt, gnutls, pam, flex, bison, gettext
  -, cmake, libjpeg_turbo, fltk
  +, cmake, libjpeg_turbo, fltk, nettle, libiconv, libtasn1
   }:
   
   with stdenv.lib;
  
positive.code:     # Prevent a store collision.
      priority = 4;
    };
  }
negative.code:   buildInputs =
      [ xorg.libX11 xorg.libXext gettext xorg.libICE xorg.libXtst xorg.libXi xorg.libSM xorg.libXft
        nasm libgcrypt gnutls pam pixman libjpeg_turbo fltk xorg.xineramaproto
        xorg.libXinerama xorg.libXcursor nettle libiconv libtasn1
      ];
  
    nativeBuildInputs =
      [ autoconf automake cvs xorg.utilmacros xorg.fontutil libtool flex bison
        cmake gettext
      ]
        ++ xorg.xorgserver.nativeBuildInputs;
  
  