diff --git a/moo/kernel/FFI.moo b/moo/kernel/FFI.moo
index 06c0e8e..ed5fa46 100644
--- a/moo/kernel/FFI.moo
+++ b/moo/kernel/FFI.moo
@@ -16,6 +16,20 @@ class FFI(Object)
 {
 	var name, ffi, funcs.
 
+	/*
+	pooldic Type
+	{
+		UINT8  := 1.
+		UINT16 := 2.
+		UINT32 := 3.
+		UINT64 := 4.
+	}
+	*/
+	/*
+	const UINT8 := 1.
+	const UINT16 := 2.
+	*/
+
 	method(#class) new: aString
 	{
 		^self new open: aString.
@@ -55,6 +69,9 @@ class FFI(Object)
 	{
 		| f rc |
 
+//self.Type.UINT8 dump.
+//#[ self.Type.UINT8,   FFI.Type.UINT16 ] dump.
+
 		/* f := self.funcs at: name ifAbsent: [ 
 			f := self.ffi getsym(name).
 			if (f isError) { FFIException signal: ('Unable to find %O' strfmt(name)) }.
@@ -71,7 +88,7 @@ class FFI(Object)
 		}.
 
 		rc := self.ffi call(f, sig, args).
-		if (rc isError)	{ FFIException signal: ('Unable to call %O' strfmt(name)) }.
+		if (rc isError)	{ FFIException signal: ('Unable to call %O - %O' strfmt(name, rc)) }.
 
 		^rc.
 	}
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index 99b32eb..de73c45 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -118,6 +118,7 @@ static struct voca_t
 	{  5, { 'c','l','a','s','s'                                           } },
 	{  6, { '#','c','l','a','s','s'                                       } },
 	{ 10, { '#','c','l','a','s','s','i','n','s','t'                       } },
+	{  5, { 'c','o','n','s','t'                                           } },
 	{  8, { 'c','o','n','t','i','n','u','e'                               } },
 	{  2, { 'd','o'                                                       } },
 	{  5, { '#','d','u','a','l'                                           } },
@@ -187,6 +188,7 @@ enum voca_id_t
 	VOCA_CLASS,
 	VOCA_CLASS_S,
 	VOCA_CLASSINST_S,
+	VOCA_CONST,
 	VOCA_CONTINUE,
 	VOCA_DO,
 	VOCA_DUAL_S,
@@ -430,6 +432,7 @@ static int is_restricted_word (const moo_oocs_t* ucs)
 	static int rw[] = 
 	{
 		VOCA_CLASS,
+		VOCA_CONST,
 		VOCA_EXTEND,
 		VOCA_FROM,
 		VOCA_IMPORT,
@@ -4014,6 +4017,12 @@ static int compile_class_level_imports (moo_t* moo)
 	return 0;
 }
 
+static int compile_class_level_consts (moo_t* moo)
+{
+	/* TODO: */
+	return 0;
+}
+
 static int compile_unary_method_name (moo_t* moo, moo_method_data_t* mth)
 {
 	MOO_ASSERT (moo, mth->name.len == 0);
@@ -9068,6 +9077,9 @@ static int __compile_class_definition (moo_t* moo, int class_type)
 			}
 			while (1);
 		}
+
+
+		/* TODO: load constants here? */
 	}
 	else
 	{
@@ -9104,6 +9116,12 @@ static int __compile_class_definition (moo_t* moo, int class_type)
 				GET_TOKEN (moo);
 				if (compile_class_level_imports(moo) <= -1) return -1;
 			}
+			else if (is_token_word(moo, VOCA_CONST))
+			{
+				/* constant declaration */
+				GET_TOKEN (moo);
+				if (compile_class_level_consts(moo) <= -1) return -1;
+			}
 			else break;
 		}
 		while (1);
diff --git a/moo/mod/ffi.c b/moo/mod/ffi.c
index d22a361..3d67cda 100644
--- a/moo/mod/ffi.c
+++ b/moo/mod/ffi.c
@@ -30,15 +30,13 @@
 #include <errno.h>
 #include <string.h>
 
-#if defined(HAVE_DYNCALL_LIB) && defined(HAVE_DYNCALL_H)
-#	define USE_DYNCALL
-#elif defined(HAVE_FFI_LIB) && defined(HAVE_FFI_H)
+#if defined(HAVE_FFI_LIB) && defined(HAVE_FFI_H)
 #	define USE_LIBFFI
+#elif defined(HAVE_DYNCALL_LIB) && defined(HAVE_DYNCALL_H)
+#	define USE_DYNCALL
 #endif
 
-#if defined(USE_DYNCALL)
-#	include <dyncall.h>
-#elif defined(USE_LIBFFI)
+#if defined(USE_LIBFFI)
 #	include <ffi.h>
 #	if (MOO_SIZEOF_LONG_LONG > 0) && !defined(ffi_type_ulonglong)
 #		if MOO_SIZEOF_LONG_LONG == MOO_SIZEOF_INT32_T
@@ -49,6 +47,8 @@
 #			define ffi_type_slonglong ffi_type_sint64
 #		endif
 #	endif
+#elif defined(USE_DYNCALL)
+#	include <dyncall.h>
 #endif
 
 #define FMTC_NULL '\0' /* internal use only */