@@ -, +, @@ 
   else if (fd >= FD_SETSIZE)
                  ^
---
 tools/watchgnupg.c | 1 +
 1 file changed, 1 insertion(+)
--- a/tools/watchgnupg.c	
+++ a/tools/watchgnupg.c	
@@ -28,6 +28,7 @@ 
 #include <stdarg.h>
 #include <assert.h>
 #include <unistd.h>
+#include <sys/select.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>
--