Index: head/stand/libsa/Makefile
===================================================================
--- head/stand/libsa/Makefile
+++ head/stand/libsa/Makefile
@@ -155,9 +155,9 @@
 
 CFLAGS.bzipfs.c+= -I${SRCTOP}/contrib/bzip2
 
-# explicit_bzero
+# explicit_bzero and calculate_crc32c
 .PATH: ${SYSDIR}/libkern
-SRCS+=  explicit_bzero.c
+SRCS+=  explicit_bzero.c crc32_libkern.c
 
 # Maybe GELI
 .if ${MK_LOADER_GELI} == "yes"
Index: head/stand/libsa/crc32_libkern.c
===================================================================
--- head/stand/libsa/crc32_libkern.c
+++ head/stand/libsa/crc32_libkern.c
@@ -0,0 +1,3 @@
+/* $FreeBSD$ */
+
+#include "../../sys/libkern/crc32.c"