anchor.diff:    sitePackages = "lib/${libPrefix}/site-packages";
   
     buildInputs = filter (p: p != null) [
  -    zlib bzip2 lzma gdbm sqlite readline ncurses openssl ]
  +    zlib bzip2 expat lzma libffi gdbm sqlite readline ncurses openssl ]
       ++ optionals x11Support [ tcl tk libX11 xproto ]
       ++ optionals stdenv.isDarwin [ CF configd ];
   
  
positive.code: { stdenv, fetchurl, fetchpatch
  , bzip2
  , gdbm
  , lzma
  , ncurses
  
negative.code:     "--enable-shared"
      "--with-threads"
      "--without-ensurepip"
      "--with-system-expat"
      "--with-system-ffi"
    ];
  
    preConfigure = ''
  