-int writeExternal(InsetExternalParams const &,
- std::string const & format,
- Buffer const &,
- std::ostream &,
- ExportData &,
- bool external_in_tmpdir = false);
+RetVal writeExternal(InsetExternalParams const &,
+ std::string const & format,
+ Buffer const &,
+ otexstream &,
+ ExportData &,
+ bool external_in_tmpdir,
+ bool dryrun);