lib: added missing include on Darwin

diff --git a/lib/semaphore.h b/lib/semaphore.h
index ad160b1fab07c9dce96745bacaf164d1550d75d7..d33280bda725f60507309c2ffd87d416f2f75b44 100644 (file)
--- a/lib/semaphore.h
+++ b/lib/semaphore.h
@@ -15,6 +15,7 @@
 #ifdef CONFIG_DARWIN
 
 #include <unistd.h>
+#include <stdio.h>
 
 /* In Darwin, sem_init() is unfortunately not implemented and the guide
  * recommends emulating it using sem_open().  */