https://git.ruby-lang.org/ruby.git/commit/?id=b8dff14afa

From b8dff14afa050c1550094420be904e00342f227b Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Mon, 5 Oct 2020 14:28:29 -0400
Subject: _GNU_SOURCE has to be before includes

---
 ujit_asm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ujit_asm.c b/ujit_asm.c
index fda657757b..0db4a540c7 100644
--- a/ujit_asm.c
+++ b/ujit_asm.c
@@ -1,11 +1,12 @@ https://github.com/ruby/ruby/blob/trunk/ujit_asm.c#L1
+// For MAP_ANONYMOUS on GNU/Linux
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <assert.h>
 
 #ifndef _WIN32
-// For MAP_ANONYMOUS on GNU/Linux
-#define _GNU_SOURCE
 // For mmapp()
 #include <sys/mman.h>
 #endif
-- 
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