The command for cloning the repo in the readme did not work for me.
$ git clone --recursive git://github.com/oseledets/ttpy.git
Cloning into 'ttpy'...
fatal: unable to connect to github.com:
github.com[0: 140.82.112.4]: errno=Connection timed out
It worked fine after changing git:// to https://
$ git clone --recursive https://github.com/oseledets/ttpy.git
Cloning into 'ttpy'...
remote: Enumerating objects: 2195, done.
remote: Counting objects: 100% (80/80), done.
...