anchor.diff:      );
   
     buildInputs =
  -    lib.optionals (!stdenv.isDarwin)
  +    [ python3 ]
  +    ++ lib.optionals (!stdenv.isDarwin)
       (
         [ libinput ]
         ++ lib.optional withGtk3 gtk3
  
positive.code:     ++ lib.optional (postgresql != null) postgresql;
  
    nativeBuildInputs =
      [ bison flex gperf lndir perl pkgconfig python2 which ];
  
    propagatedNativeBuildInputs = [ lndir ];
  
  
negative.code:   stdenv, lib,
    src, patches, version, qtCompatVersion,
  
    coreutils, bison, flex, gdb, gperf, lndir, perl, pkgconfig, python3,
    which,
    # darwin support
    darwin, libiconv,
  