diff -r 3addb8cfcc3e -r 44d929ff268e bmsd/bms.h
--- a/bmsd/bms.h	Wed May 05 20:32:07 2021 +0200
+++ b/bmsd/bms.h	Fri May 07 13:20:53 2021 +0200
@@ -8,6 +8,8 @@
 #define TRUE 1
 #define FALSE 0
 
+#define _GNU_SOURCE  // for secure_getenv()
+
 #include "../config.h"
 
 #include <stdlib.h>