From fc87d96e3b5e4ba6d80e58e94e271ad305b7a606 Mon Sep 17 00:00:00 2001
From: Dhiru Kholia <dhiru.kholia@gmail.com>
Date: Wed, 15 Nov 2023 21:13:23 +0530
Subject: [PATCH] Fix compilation on Ubuntu Linux
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Without this change:

```
$ make
...
demo/decode_ft8.c:347:31: error: ‘CLOCK_REALTIME’ undeclared (first use in this function)
  347 |                 clock_gettime(CLOCK_REALTIME, &spec);
```
---
 demo/decode_ft8.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/demo/decode_ft8.c b/demo/decode_ft8.c
index 1f45967..f410902 100644
--- a/demo/decode_ft8.c
+++ b/demo/decode_ft8.c
@@ -1,3 +1,5 @@
+#define _POSIX_C_SOURCE 199309L
+
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>