Index: sys/compat/linuxkpi/common/include/linux/time.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/time.h
+++ sys/compat/linuxkpi/common/include/linux/time.h
@@ -37,6 +37,8 @@
 
 #define	timespec64 timespec
 
+#define	CLOCK_BOOTTIME	CLOCK_UPTIME
+
 #include <sys/time.h>
 #include <sys/stdint.h>