Index: uspace/lib/libc/include/sys/time.h
===================================================================
--- uspace/lib/libc/include/sys/time.h	(revision 00acd66d3981789b3f8b04cdd854d29343dd9aa0)
+++ uspace/lib/libc/include/sys/time.h	(revision 975f62fac99fcc98236836b8036fb7e11c351143)
@@ -53,5 +53,9 @@
 };
 
-int gettimeofday(struct timeval *tv, struct timezone *tz);
+extern void tv_add(struct timeval *tv, suseconds_t usecs);
+extern suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2);
+extern int tv_gt(struct timeval *tv1, struct timeval *tv2);
+extern int tv_gteq(struct timeval *tv1, struct timeval *tv2);
+extern int gettimeofday(struct timeval *tv, struct timezone *tz);
 
 #endif