ctime and time warnings compiling on OSX

I am getting some warnings when compiling a C program on OSX 10.6.5, which seem to be quite critical. extras.c:15: warning: implicit declaration of function ‘time’ extras.c: In function ‘outlog’: extras.c:363: warning: implicit declaration of function ‘ctime’ The corresponding lines are as follows: Lines 13-15: RANDNUMGEN = gsl_rng_alloc(gsl_rng_taus); long t1; (void) time(&t1); Lines 360-363: if (LOG==NULL) { LOG=stdout;} TVAL = time(NULL); char* TIMESTRING = ctime(&TVAL); I believe the program was originally written for Linux, so I wonder if there is a difference between `time` and `ctime` on the two platforms?

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