At a minimum on Window you should use GLEW. There are no system headers/libs for accessing modern OpenGL on Windows so you need to query every function at runtime using wglGetProcAddress. GLEW automates all of this, it queries all the function pointers your card supports and puts them in global function pointers so you can use it like a regular C API. It also provides a header with all the typedefs and constants you'll need to work with these functions.
It's worth pointing out that gDebugger is basically a legacy application now. It was purchased by AMD and has been integrated into their CodeXL profiler/debugger.