Index: tools/servers/index_server/server.h
--- tools/servers/index_server/server.h.orig
+++ tools/servers/index_server/server.h
@@ -21,6 +21,7 @@
 #define SERVER_H
 #include <netinet/in.h>
 #include <stdio.h>
+#include <sys/select.h>
 
 class Client;
 
