diff --git a/moo/kernel/Moo.moo b/moo/kernel/Moo.moo
index 03a135d..38a8e7b 100644
--- a/moo/kernel/Moo.moo
+++ b/moo/kernel/Moo.moo
@@ -10,6 +10,6 @@
 #include 'Stream.moo'.
 
 (* -------------------------------------------------------------------------- *)
-#include 'FFI.moo'.
+## #include 'FFI.moo'.
 #include 'Stdio.moo'.
 ## #include 'Console.moo'.
diff --git a/moo/lib/moo-prv.h b/moo/lib/moo-prv.h
index b7951fc..711f9f1 100644
--- a/moo/lib/moo-prv.h
+++ b/moo/lib/moo-prv.h
@@ -1385,6 +1385,21 @@ moo_oop_t moo_truncfpdecval (
 	moo_ooi_t   ns
 );
 
+/* ========================================================================= */
+/* logfmt.c                                                                  */
+/* ========================================================================= */
+moo_ooi_t moo_sproutbfmt (
+	moo_t*           moo,
+	moo_bitmask_t    mask,
+	const moo_bch_t* fmt,
+	...
+);
+
+int moo_sprintfmtst (
+	moo_t*            moo,
+	moo_ooi_t         nargs
+);
+
 /* ========================================================================= */
 /* exec.c                                                                    */
 /* ========================================================================= */