For the python version you will need pyutil [1]. 

To build the C version you will need libzstr [2], a C library for safe, efficient,
8-bit clean strings.

Please see the DESIGN file for a justification of the specific base-32 encoding 
and why it differs from previous encodings such as [3].

[1] https://pypi.python.org/pypi/pyutil
[2] http://sourceforge.net/projects/libzstr/
[3] http://www.ietf.org/internet-drafts/draft-josefsson-base-encoding-04.txt
