-extern tree convert_to_integer PROTO ((tree, tree));
-extern tree convert_to_pointer PROTO ((tree, tree));
-extern tree convert_to_real PROTO ((tree, tree));
+#ifndef GCC_CONVERT_H
+#define GCC_CONVERT_H
+
+extern tree convert_to_integer (tree, tree);
+extern tree convert_to_pointer (tree, tree);
+extern tree convert_to_real (tree, tree);
+extern tree convert_to_fixed (tree, tree);
+extern tree convert_to_complex (tree, tree);
+extern tree convert_to_vector (tree, tree);
+
+#endif /* GCC_CONVERT_H */