https://git.ruby-lang.org/ruby.git/commit/?id=5f821ee977

From 5f821ee9777b1c13364892a65e9af97545d14bb6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 9 Mar 2021 20:36:15 +0900
Subject: Recheck ucontext functions to make reconfig stable

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 1dcf48b..45417cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2419,7 +2419,7 @@ AS_IF([test "${universal_binary-no}" = yes ], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L2419
 AC_ARG_WITH(coroutine,
     AS_HELP_STRING([--with-coroutine=IMPLEMENTATION], [specify the coroutine implementation to use]),
     [rb_cv_coroutine=$withval])
-AS_CASE([$rb_cv_coroutine], [yes|''], [
+AS_CASE([$rb_cv_coroutine], [yes|ucontext|copy|''], [
     AC_MSG_CHECKING(native coroutine implementation for ${target_cpu}-${target_os})
     rb_cv_coroutine=
     AS_CASE(["$target_cpu-$target_os"],
-- 
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