NOTE, at any time (after this install), you can run the setup-x86_64.exe to install new packages, OR to update the packages which are alrady installed. NOTE, when doing so, it is always best to download the newest version of this tool from
www.cygwin.com. Also, when running the update, make sure that ALL cygwin terminal are shut down, AND that all processes built using cygwin (linked against the dll's) are shutdown. Cygwin will warn you (hopefully), that files are locked. But Shut things down anyway, just to be safe.