NfSpy uses Python's distutils package, so installation is as simple as # setup.py install
NfSpy uses some syntax that is not backwards compatible with versions of Python before 2.6. For Python 2.4 compatibility, check out the twofour branch, which should work, but will not receive future updates
NfSpy was updated to NFSv3 on Fri Feb 24 2012. The nfsv2 branch contains the previous version, which supports NFSv2.