RTA_PREF was added in kernel-4.1

diff --git a/src/route.h b/src/route.h
index a061497c14a573c078b45ac048bc6d203a4166ff..d94fc25d5a4496b1c6c73435d2dd0953f2107600 100644 (file)
--- a/src/route.h
+++ b/src/route.h
@@ -61,7 +61,10 @@
 #endif
 
 #ifdef __linux__
-# define HAVE_ROUTE_PREF
+# include <linux/version.h> /* RTA_PREF is only an enum.... */
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
+#  define HAVE_ROUTE_PREF
+# endif
 #endif
 
 #if defined(__OpenBSD__) || defined (__sun)