I'm currently on my phone, and your Google docs isn't opening. However, MinGW is not one of our supported platforms. We have precompiled versions available though. Look in either the c++ or java folders here
http://first.wpi.edu/FRC/roborio/mav...networktables/. You want the - desktop classifiers for either the c++ or java. For c++, extract the binaries from the zip and grab the Windows one for your architecture. For Java, the provided jar will run on Mac, Windows, and Linux.