Taken from AUR

diff --git a/lsyncd.h b/lsyncd.h
index 9300a09..efda2fd 100644
--- a/lsyncd.h
+++ b/lsyncd.h
@@ -13,11 +13,13 @@
 
 // some older machines need this to see pselect
 #define _DEFAULT_SOURCE 1
+#define _BSD_SOURCE 1
 #define _XOPEN_SOURCE 700
 #define _DARWIN_C_SOURCE 1
 
 #define LUA_COMPAT_ALL
 #define LUA_COMPAT_5_1
+#define LUA_COMPAT_5_3
 
 // includes needed for headerfile
 #include "config.h"