-bool openFileWrite(std::ofstream & ofs, std::string const & fname);
-bool openFileWrite(lyx::odocfstream & ofs, std::string const & fname);
+
+namespace lyx {
+
+namespace support { class FileName; }
+
+bool openFileWrite(std::ofstream & ofs, support::FileName const & fname);
+bool openFileWrite(ofdocstream & ofs, support::FileName const & fname);
+
+
+} // namespace lyx