Re: flockfile undefined on Mingw64 platform

[Paul Eggert]

I'm really the wrong person to be fixing this sort of thing since I 
don't use MS-Windows. However, I installed a getopt workaround that I 
hope is obvious, here:

http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=19fb4184b097eee0f17f16bdd40d60e3e6d91d45
Perhaps Zack can comment when he finds the time, as he knowsthis part of 
the code better.