--- a/fftools/ffmpeg.c	2017-07-29 19:49:29.000000000 +0200
+++ b/fftools/ffmpeg.c	2018-09-02 20:32:27.666725200 +0200
@@ -23,6 +23,11 @@
  * multimedia converter based on the FFmpeg libraries
  */
 
+#define _WIN32_WINNT 0x0502	// Must be less than 0x0600, because otherwise WinSock2.h defines "pollfd" which then gets redefined in "os_support.h".
+							// I suppose that "HAVE_STRUCT_POLLFD" should be 1, but it happens to be 0. Sorry, this is somewhat beyond me.
+#define WIN32_LEAN_AND_MEAN
+
+
 #include "config.h"
 #include <ctype.h>
 #include <string.h>