--- ntpsec-1.2.4/attic/timestamp-info.c	2025-04-18 21:54:14.000000000 +0200
+++ ntpsec-1.2.4/attic/timestamp-info.c.new	2025-07-14 22:00:20.742125128 +0200
@@ -19,7 +19,7 @@
 
 #include <sys/param.h>
 #include <sys/socket.h>
-#ifndef __linux__
+#if !defined(__linux__) && !defined(__sun)
 #include <sys/sysctl.h>
 #endif
 #include <sys/time.h>