--- ruby-2.5.0/configure.ac.orig	2016-02-13 19:58:24.531685400 +0900
+++ ruby-2.5.0/configure.ac	2016-02-13 19:58:24.567691100 +0900
@@ -1218,7 +1218,8 @@
 		rb_cv_negative_time_t=yes
 		AC_CHECK_TYPE([NET_LUID], [], [],
 			      [@%:@include <winsock2.h>
-			      @%:@include <iphlpapi.h>])
+			       @%:@include <windows.h>
+			       @%:@include <iphlpapi.h>])
 		AS_IF([test x"$ac_cv_type_NET_LUID" = xyes], [
 		    AC_DEFINE(HAVE_TYPE_NET_LUID, 1)
 		])