From the "release" notes (Windows):
* 'Build modules' requires MINGW to be installed under Win32. You will also need to add mingw/bin to your PATH env variable and add an env variable called MINGW pointing to the root mingw dir.
* 'Build modules' requires MINGW to be installed under Win32. You will also need to add mingw/bin to your PATH env variable and add an env variable called MINGW pointing to the root mingw dir.