From 1f47a287ee4f8b1d007dff878b23dd0cd6104f38 Mon Sep 17 00:00:00 2001
From: "K.Takata" <kentkt@csc.jp>
Date: Mon, 31 Jan 2022 13:25:36 +0000
Subject: patch 8.2.4271: MS-Windows: cannot build with Ruby 3.1.0

Problem:    MS-Windows: cannot build with Ruby 3.1.0.
Solution:   Adjust the DLL name and include directory. (Ken Takata,
            closes #9666)
---
 src/Make_cyg_ming.mak | 6 +++++-
 src/Make_mvc.mak      | 4 ++++
 src/version.c         | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index ab71b26f14..585539d484 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -466,6 +466,8 @@ RUBY_PLATFORM = i586-mswin32
 RUBY_PLATFORM = i386-mingw32
   else ifneq ($(wildcard $(RUBY)/lib/ruby/$(RUBY_API_VER_LONG)/x64-mingw32),)
 RUBY_PLATFORM = x64-mingw32
+  else ifneq ($(wildcard $(RUBY)/lib/ruby/$(RUBY_API_VER_LONG)/x64-mingw-ucrt),)
+RUBY_PLATFORM = x64-mingw-ucrt
   else
 RUBY_PLATFORM = i386-mswin32
   endif
@@ -479,7 +481,9 @@ RUBY_INSTALL_NAME = mswin32-ruby$(RUBY_API_VER)
 # Base name of msvcrXX.dll which is used by ruby's dll.
 RUBY_MSVCRT_NAME = msvcrt
    endif
-   ifeq ($(ARCH),x86-64)
+   ifeq ($(RUBY_PLATFORM),x64-mingw-ucrt)
+RUBY_INSTALL_NAME = x64-ucrt-ruby$(RUBY_API_VER)
+   else ifeq ($(ARCH),x86-64)
 RUBY_INSTALL_NAME = x64-$(RUBY_MSVCRT_NAME)-ruby$(RUBY_API_VER)
    else
 RUBY_INSTALL_NAME = $(RUBY_MSVCRT_NAME)-ruby$(RUBY_API_VER)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 2725e74370..00fe774856 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -1186,7 +1186,11 @@ RUBY_MSVCRT_NAME = $(MSVCRT_NAME)
 !   if "$(CPU)" == "i386"
 RUBY_INSTALL_NAME = $(RUBY_MSVCRT_NAME)-ruby$(RUBY_API_VER)
 !   else # CPU
+!    if EXIST($(RUBY)/lib/ruby/$(RUBY_API_VER_LONG)/x64-mingw-ucrt)
+RUBY_INSTALL_NAME = x64-ucrt-ruby$(RUBY_API_VER)
+!    else
 RUBY_INSTALL_NAME = x64-$(RUBY_MSVCRT_NAME)-ruby$(RUBY_API_VER)
+!    endif
 !   endif # CPU
 !  endif # RUBY_INSTALL_NAME
 
diff --git a/src/version.c b/src/version.c
index a8db11072e..917362755c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4271,
 /**/
     4270,
 /**/
-- 
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