I am trying to install PyGtk on windows 7 for Python 2.7, but when go to use pip to install PyGtk it says I need PyGObject so I installed the Visual C++ package for Python (I know I have the correct version) and tried using pip to install PyGObject, but it keeps coming out with an error message saying that cairo.h is missing, and sure enough I check in the directory and it wasn't there. How am I supposed to install PyGObject?