* (Re-)queries the outputs via RandR and stores them in the list of outputs.
*
*/
-void randr_query_outputs();
+void randr_query_outputs(void);
/**
* Returns the first output which is active.
*
*/
-Output *get_first_output();
+Output *get_first_output(void);
/**
* Returns the output with the given name if it is active (!) or NULL.