anchor.diff:        sha256 = "0b3rmy6acp2vmf5nill3aknxvr9a5aawk1vnphkah61anxp62gsr";
       };
   
  -    # Note: We need to have `setuptools' in the path to be able to use
  -    # PyOpenGL.
  -    buildInputs = [ makeWrapper xpdf pillow pyopengl pygame ];
  +    buildInputs = [ makeWrapper pythonEnv ];
   
       configurePhase = ''
  +      # Let's fail at build time if the library we're substituting in doesn't
  +      # exist/isn't marked as executable
  +      test -x ${SDL}/lib/libSDL.so
         sed -i "impressive.py" \
  -          -e 's|^#!/usr/bin/env.*$|#!${python}/bin/python|g'
  +          -e '/^__website__/a SDL_LIBRARY = "${SDL}/lib/libSDL.so"' \
  +          -e 's/sdl = CDLL.*/sdl = CDLL(SDL_LIBRARY)/' \
  +          -e 's^FontPath =.*/usr/.*$^FontPath = ["${dejavu_fonts}/share/fonts", ""]^'
       '';
   
       installPhase = ''
  -      mkdir -p "$out/bin" "$out/share/doc/impressive"
  +      mkdir -p "$out/bin" "$out/share/doc/impressive" "$out/share/man/man1"
         mv impressive.py "$out/bin/impressive"
  -      mv * "$out/share/doc/impressive"
  +      mv impressive.1 "$out/share/man/man1"
  +      mv changelog.txt impressive.html license.txt "$out/share/doc/impressive"
   
  -      # XXX: We have to reiterate PyOpenGL's dependencies here.
  -      #
  -      # `setuptools' must be in the Python path as it's used by
  -      # PyOpenGL.
  -      #
  -      # We set $LIBRARY_PATH (no `LD_'!) so that ctypes can find
  -      # `libGL.so', which it does by running `gcc', which in turn
  -      # honors $LIBRARY_PATH.  See
  -      # http://python.net/crew/theller/ctypes/reference.html#id1 .
         wrapProgram "$out/bin/impressive" \
  -         --prefix PATH ":" "${xpdf}/bin" \
  -         --prefix PYTHONPATH ":" \
  -                  ${lib.concatStringsSep ":"
  -                     (map (path:
  -                            path + "/lib/${python.libPrefix}/site-packages")
  -                          [ pillow pyopengl pygame setuptools ])} \
  -         --prefix LIBRARY_PATH ":" "${lib.makeLibraryPath [ mesa freeglut SDL ]}"
  +         --prefix PATH ":" "${ghostscript}/bin:${pdftk}/bin"
       '';
   
       meta = {
  
positive.code: { fetchurl, stdenv, python2Packages, makeWrapper, lib
  , xpdf, mesa, SDL, freeglut }:
  
  let
    inherit (python2Packages) python pyopengl pygame setuptools pillow;
    version = "0.11.1";
  in stdenv.mkDerivation {
      # This project was formerly known as KeyJNote.
      # See http://keyj.s2000.ws/?p=77 for details.
  
      name = "impressive-${version}";
  
  
negative.code: 
        license = stdenv.lib.licenses.gpl2;
  
        maintainers = with lib.maintainers; [ lheckemann ];
        platforms = stdenv.lib.platforms.mesaPlatforms;
      };
    }
  