--- tests/anustart.c.orig	2024-01-06 00:03:10.000000000 +0800
+++ tests/anustart.c	2024-09-24 18:32:25.000000000 +0800
@@ -64,6 +64,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <limits.h>
+#include <signal.h>
 
 char const *progname;