*** gawk-3.1.8/posix/gawkmisc.c  2017-06-09 08:04:35.260364000 +0200
--- gawk-3.1.8-patched/posix/gawkmisc.c  2017-06-08 23:54:41.644575800 +0200
***************
*** 1,3 ****
--- 1,6 ----
+ #ifdef __CYGWIN__
+ #include <io.h>
+ #endif
  /* gawkmisc.c --- miscellaneous gawk routines that are OS specific.

     Copyright (C) 1986, 1988, 1989, 1991 - 1998, 2001 - 2004 the Free Software Foundation, Inc.