anchor.diff:  , isPy3
   , lib
   
  -, pkgs
  -, pythonPackages
  +, libjpeg
  +, libpng
  +, libx11
  +, portmidi
  +, sdl
  +, sdl-image
  +, sdl-mixer
  +, sdl-ttf
  +, smpeg
   }:
   
   let
  
positive.code:   };
  
    buildInputs = [
      pkgs.SDL
      pkgs.SDL_image
      pkgs.SDL_mixer
      pkgs.SDL_ttf
      pkgs.libpng
      pkgs.libjpeg
      pkgs.smpeg
      pkgs.portmidi
      pkgs.xorg.libX11
    ];
  
    patches = [
  
negative.code: 
    preConfigure = ''
      for i in \
        ${sdl-image} \
        ${sdl-mixer} \
        ${sdp-ttf} \
        ${libpng} \
        ${libjpeg} \
        ${portmidi} \
        ${libx11}; do
        sed -i config_unix.py \
          -e "/origincdirs =/a'$i/include',"
        sed -i config_unix.py \
  