From ce20367a0e2f1fcfabebf3b6bea732fc71fa79f7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 23 May 2024 12:35:09 +0900
Subject: Define `incflags` also on mswin

---
 win32/Makefile.sub | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 7dbb020eee..61cca10857 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -160,6 +160,9 @@ OPTFLAGS = -O2b2xg-
 OPTFLAGS = -O2sy-
 !endif
 !endif
+!if !defined(incflags)
+incflags =
+!endif
 !if !defined(PLATFORM)
 PLATFORM = mswin32
 !endif
@@ -970,6 +973,7 @@ s,@WERRORFLAG@,$(WERRORFLAG),;t t
 s,@DEFS@,$(DEFS),;t t
 s,@CPPFLAGS@,$(CPPFLAGS),;t t
 s,@CXXFLAGS@,$(CXXFLAGS),;t t
+s,@incflags@,$(incflags),;t t
 s,@FFLAGS@,$(FFLAGS),;t t
 s,@LDFLAGS@,$(LDFLAGS),;t t
 s,@LIBS@,user32.lib,;t t
-- 
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