Index: head/sys/cddl/contrib/opensolaris/common/lz4/lz4.h
===================================================================
--- head/sys/cddl/contrib/opensolaris/common/lz4/lz4.h
+++ head/sys/cddl/contrib/opensolaris/common/lz4/lz4.h
@@ -43,6 +43,11 @@
 extern size_t lz4_compress(void *, void *, size_t, size_t, int);
 extern int lz4_decompress(void *, void *, size_t, size_t, int);
 
+#if defined(_KERNEL) || defined(_FAKE_KERNEL)
+extern void lz4_init(void);
+extern void lz4_fini(void);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
Index: head/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
===================================================================
--- head/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
+++ head/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
@@ -1024,7 +1024,7 @@
 }
 
 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
-extern void
+void
 lz4_init(void)
 {
 
@@ -1034,7 +1034,7 @@
 #endif
 }
 
-extern void
+void
 lz4_fini(void)
 {