-extern rtsBool do_prof_ticks; /* profiling ticks on/off */
-
-nat initialize_virtual_timer ( nat ms );
-int install_vtalrm_handler ( void );
-void block_vtalrm_signal ( void );
-void unblock_vtalrm_signal ( void );
-unsigned int getourtimeofday ( void );
+extern unsigned int getourtimeofday ( void );
+#if 0
+/* unused */
+extern void block_vtalrm_signal ( void );
+extern void unblock_vtalrm_signal ( void );
+#endif
+#endif /* __ITIMER_H__ */