From 7badd2d5b29d1f591c34ec49abb9f48e8bb49be1 Mon Sep 17 00:00:00 2001
From: "L. Pereira" <l@tia.mat.br>
Date: Thu, 21 Jul 2022 19:00:46 -0700
Subject: [PATCH] Set _XOPEN_SOURCE when building on Darwin

On non-freestanding builds, including <ucontext.h> on an ARM Darwin
system will produce the following error:

  In file included from include/libucontext/bits.h:6:
  /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/
	usr/include/ucontext.h:51:2: error: The deprecated
	ucontext routines require _XOPEN_SOURCE to be defined

Defining this macro on Darwin systems will make the building pass.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index de13a8e..373ed3c 100644
--- a/Makefile
+++ b/Makefile
@@ -31,6 +31,7 @@ ifneq ($(shell uname),Darwin)
 else
 	# Darwin does not support aliases
 	EXPORT_UNPREFIXED := no
+	CPPFLAGS += -D_XOPEN_SOURCE
 endif
 FREESTANDING := no