Building Infiniminer requires Visual Studio 2008 and XNA Game Studio 3.0.
Strike that - you'll need 2015 and 4.0 - eventually I hope to port this mess to Mono for that sweet cross-platform.
You'll also need the fonts 04b03b and 04b08 from here
Simply build the solution and you should be good to go.
As Zach no longer has an offical repository for the game, this is where you'll put all your problems!
Just go to our issues page!