Index: head/sys/compat/linux/linux_mib.h
===================================================================
--- head/sys/compat/linux/linux_mib.h
+++ head/sys/compat/linux/linux_mib.h
@@ -42,8 +42,19 @@
 
 int	linux_kernver(struct thread *td);
 
-#define	LINUX_KERNVER_2004000		2004000
-#define	LINUX_KERNVER_2006000		2006000
+#define	LINUX_KVERSION		2
+#define	LINUX_KPATCHLEVEL	6
+#define	LINUX_KSUBLEVEL		18
+
+#define	LINUX_KERNVER(a,b,c)	(((a) << 16) + ((b) << 8) + (c))
+#define	LINUX_VERSION_CODE	LINUX_KERNVER(LINUX_KVERSION,		\
+				    LINUX_KPATCHLEVEL, LINUX_KSUBLEVEL)
+#define	LINUX_KERNVERSTR(x)	#x
+#define	LINUX_XKERNVERSTR(x)	LINUX_KERNVERSTR(x)
+#define	LINUX_VERSION_STR	LINUX_XKERNVERSTR(LINUX_KVERSION.LINUX_KPATCHLEVEL.LINUX_KSUBLEVEL)
+
+#define	LINUX_KERNVER_2004000	LINUX_KERNVER(2,4,0)
+#define	LINUX_KERNVER_2006000	LINUX_KERNVER(2,6,0)
 
 #define	linux_use26(t)		(linux_kernver(t) >= LINUX_KERNVER_2006000)
 
Index: head/sys/compat/linux/linux_mib.c
===================================================================
--- head/sys/compat/linux/linux_mib.c
+++ head/sys/compat/linux/linux_mib.c
@@ -129,9 +129,9 @@
 
 static struct linux_prison lprison0 = {
 	.pr_osname =		"Linux",
-	.pr_osrelease =		"2.6.18",
+	.pr_osrelease =		LINUX_VERSION_STR,
 	.pr_oss_version =	0x030600,
-	.pr_osrel =		2006018
+	.pr_osrel =		LINUX_VERSION_CODE
 };
 
 static unsigned linux_osd_jail_slot;