server: Fix compilation under Darwin 7.
diff --git a/server/signal.c b/server/signal.c
index c873344..04bd50b 100644
--- a/server/signal.c
+++ b/server/signal.c
@@ -22,6 +22,7 @@
 
 #include <signal.h>
 #include <stdio.h>
+#include <sys/time.h>
 #ifdef HAVE_POLL_H
 #include <poll.h>
 #endif