diff -urN openswan-2.4.7/linux/include/openswan/ipsec_kversion.h openswan-2.4.7-2.6.19/linux/include/openswan/ipsec_kversion.h
--- openswan-2.4.7/linux/include/openswan/ipsec_kversion.h	2006-07-29 08:00:40.000000000 +0300
+++ openswan-2.4.7-2.6.19/linux/include/openswan/ipsec_kversion.h	2006-12-01 21:15:45.000000000 +0200
@@ -142,6 +142,10 @@
 #define HAVE_NEW_SKB_LINEARIZE
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
+#define VOID_SOCK_UNREGISTER
+#endif
+
 #ifdef NET_21
 #  include <linux/in6.h>
 #else
diff -urN openswan-2.4.7/linux/net/ipsec/pfkey_v2.c openswan-2.4.7-2.6.19/linux/net/ipsec/pfkey_v2.c
--- openswan-2.4.7/linux/net/ipsec/pfkey_v2.c	2006-10-10 23:43:28.000000000 +0300
+++ openswan-2.4.7-2.6.19/linux/net/ipsec/pfkey_v2.c	2006-12-01 21:17:16.000000000 +0200
@@ -1503,7 +1503,11 @@
 	
         printk(KERN_INFO "klips_info:pfkey_cleanup: "
 	       "shutting down PF_KEY domain sockets.\n");
+#ifdef VOID_SOCK_UNREGISTER
+		 sock_unregister(PF_KEY);
+#else
         error |= sock_unregister(PF_KEY);
+#endif
 
 	error |= supported_remove_all(SADB_SATYPE_AH);
 	error |= supported_remove_all(SADB_SATYPE_ESP);