+extern tree build_function_type_array (tree, int, tree *);
+extern tree build_varargs_function_type_array (tree, int, tree *);
+#define build_function_type_vec(RET, V) \
+ build_function_type_array (RET, VEC_length (tree, V), VEC_address (tree, V))
+#define build_varargs_function_type_vec(RET, V) \
+ build_varargs_function_type_array (RET, VEC_length (tree, V), \
+ VEC_address (tree, V))