gsd.py doesn't seem to work on a 64 bit system?

[GoogleCodeExporter]

guilala$ python gsd.py test.svg 
Traceback (most recent call last):
  File "gsd.py", line 756, in <module>
    g.fromGSD(filename)
  File "gsd.py", line 611, in fromGSD
    index, group, type, count, data = lexer.next()
  File "gsd.py", line 408, in lexer
    line, section, type, count = struct.unpack('4B',b4)
struct.error: unpack requires a string argument of length 4

Original issue reported on code.google.com by transfor...@gmail.com on 19 Dec 2012 at 6:51