Bugfix release, mostly for compatibility with recent Gammu versions.
You are downloading python-gammu source code. To compile it you need some development environment for your platform, Gammu and Python.
The easiest way to install it is using pip:
pip install python-gammu
91035d419e242390f85c451f33e74cd66ea6ba4be9a2c1436344814578d16afa
871e3450a26397d555c92926382edf0e6a58431fe53613563f5a313ad752ff88
f276234d4c2e12f4dc045ecb1123218bb327ae59abf688548c04935e55f03103