This is a small, portable library to handle USB gamepad input devices.
See source/gamepad/Gamepad.h for information about the API.
Building shouldn't be much of a problem.
Simply run make from the root of the repository. The produced shared library will be in the build directory. You will need GCC or Clang, GNUMake and cmake.
Launch the Visual Studio developer environment console and run:
mkdir build
cd build
cmake -G "NMake Makefiles" ..
nmake
The produced DLL will be in the build directory. Aside from Visual Studio and cmake you will need the WindowsSDK.