From c290ba5b7d4e9e4a5f02340a22e6c9c46564906b Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 31 Oct 2017 13:18:21 -0600
Subject: [PATCH] Define _GNU_SOURCE

Might help with https://github.com/behdad/harfbuzz/pull/592
Ie. bringing in qsort_r() prototype always.
---
 src/hb-private.hh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hb-private.hh b/src/hb-private.hh
index 6f2106ee2..6d54eef56 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -92,6 +92,7 @@ extern "C" void  hb_free_impl(void *ptr);
 
 #endif // __cplusplus < 201103L
 
+#define _GNU_SOURCE 1
 
 #if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
 #define likely(expr) (__builtin_expect (!!(expr), 1))