diff -ruN gdb-8.2/gdb/gnulib/import/strerror-override.c gdb-8.2-mingw/gdb/gnulib/import/strerror-override.c
--- gdb-8.2/gdb/gnulib/import/strerror-override.c	2018-09-05 07:44:28 +0000
+++ gdb-8.2-mingw/gdb/gnulib/import/strerror-override.c	2018-11-30 19:37:03 +0000
@@ -25,6 +25,9 @@
 
 #if GNULIB_defined_EWINSOCK /* native Windows platforms */
 # if HAVE_WINSOCK2_H
+#  ifdef __MINGW32__
+#  include <winerror.h>
+#  endif
 #  include <winsock2.h>
 # endif
 #endif
diff -ruN gdb-8.2/gdb/ser-mingw.c gdb-8.2-mingw/gdb/ser-mingw.c
--- gdb-8.2/gdb/ser-mingw.c	2018-09-05 07:44:28 +0000
+++ gdb-8.2-mingw/gdb/ser-mingw.c	2018-11-30 19:57:46 +0000
@@ -29,6 +29,10 @@
 #include <unistd.h>
 #include <sys/types.h>
 
+#ifndef ERROR_IO_PENDING
+#include <winerror.h>
+#endif
+
 #include "command.h"
 
 struct ser_windows_state