--- ser-mingw.c	2017-01-21 13:46:47 +0000
+++ ser-mingw.c-pr_build_23568	2018-08-28 11:44:38 +0000
@@ -31,6 +31,10 @@
 
 #include "command.h"
 
+#ifndef ERROR_IO_PENDING
+#include <winerror.h>
+#endif
+
 void _initialize_ser_windows (void);
 
 struct ser_windows_state