extern int mlt_factory_init( const char *prefix );
extern const char *mlt_factory_prefix( );
extern char *mlt_environment( const char *name );
+extern int mlt_environment_set( const char *name, const char *value );
extern mlt_properties mlt_factory_event_object( );
extern mlt_producer mlt_factory_producer( const char *name, void *input );
extern mlt_filter mlt_factory_filter( const char *name, void *input );