https://git.ruby-lang.org/ruby.git/commit/?id=dbfd4b780e

From dbfd4b780e3914a3f27e92c2248254452bf0fd6b Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 4 Dec 2019 20:59:39 +0900
Subject: coroutine/ucontext/Context.c: Include "ruby/config.h" for Solaris

getcontext, makecontext, and swapcontext seem to be available only when
`__EXTENSION__` is defined on Solaris.

diff --git a/coroutine/ucontext/Context.c b/coroutine/ucontext/Context.c
index ab8fda9..9ce7685 100644
--- a/coroutine/ucontext/Context.c
+++ b/coroutine/ucontext/Context.c
@@ -5,6 +5,7 @@ https://github.com/ruby/ruby/blob/trunk/coroutine/ucontext/Context.c#L5
  *  Copyright, 2019, by Samuel Williams. All rights reserved.
 */
 
+#include "ruby/config.h"
 #include "Context.h"
 
 void coroutine_trampoline(void * _start, void * _context)
-- 
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