Patch from Shaun Jackman:

Replace uptime with time(NULL). time is more portable than uptime and
eliminates the need to define uptime, reducing code size slightly.

networking/udhcp/common.h

@@ -39,7 +39,6 @@ enum syslog_levels {
 #include <syslog.h>
 #endif
 
-long uptime(void);
 void background(const char *pidfile);
 void start_log_and_pid(const char *client_server, const char *pidfile);
 void background(const char *pidfile);