https://git.ruby-lang.org/ruby.git/commit/?id=c87c027f18

From c87c027f18c005460746a74c07cd80ee355b16e4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 21 Dec 2021 16:31:43 +0900
Subject: configure.in: unexpand exec_prefix in includedir

Replace `exec_prefix` in includedir as well as bindir, libdir, and
so on. [Bug #18373]
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7177d5bb8e5..5a6b074f8a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3297,7 +3297,7 @@ AS_IF([test x"${exec_prefix}" != xNONE], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L3297
     RUBY_EXEC_PREFIX=$ac_default_prefix
 ])
 pat=`echo "${RUBY_EXEC_PREFIX}" | tr -c '\012' .`'\(.*\)'
-for var in bindir libdir rubylibprefix; do
+for var in bindir includedir libdir rubylibprefix; do
     eval val='"$'$var'"'
     AS_CASE(["$val"], ["${RUBY_EXEC_PREFIX}"*], [val='${exec_prefix}'"`expr \"$val\" : \"$pat\"`"])
     eval $var='"$val"'
-- 
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