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-rw-r--r--src/config.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/config.h b/src/config.h
index 984e260..013751c 100644
--- a/src/config.h
+++ b/src/config.h
@@ -7,4 +7,10 @@
#define MQTT_INLINE inline
#endif
+#if __STDC_VERSION__ >= 199901L
+#define _XOPEN_SOURCE 600
+#else
+#define _XOPEN_SOURCE 500
+#endif
+
#endif