hello.c: add header

diff --git a/hello/hello.c b/hello/hello.c
index 821bed33ea436ed081bb19c0e8f012be9daab9f1..102b7db258ce566daff95bc2ce540c629a75d1f8 100644 (file)
--- a/hello/hello.c
+++ b/hello/hello.c
@@ -5,6 +5,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <signal.h>
 
 #include "marker.h"
 #include "usterr.h"