--- a/thermferm/thermferm.h	Fri Jul 20 21:37:45 2018 +0200
+++ b/thermferm/thermferm.h	Sat Jul 21 20:40:02 2018 +0200
@@ -20,6 +20,7 @@
 #include <sys/time.h>
 #include <sys/un.h>
 #include <sys/utsname.h>
+#include <ifaddrs.h>
 #include <time.h>
 #include <fcntl.h>
 #include <syslog.h>