cc -pthread -Wall -Wextra -Werror=implicit-function-declaration time/clock_nanosleep.c -o time/clock_nanosleep -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv relibc getrlimit(3, 0x7ffffffffc80): not implemented relibc getrlimit(3, 0x7ffffffffba0): not implemented relibc getrlimit(9, 0x7ffffffffb60): not implemented relibc getrlimit(9, 0x7ffffffffb90): not implemented relibc getrlimit(5, 0x7ffffffffb90): not implemented relibc getrlimit(9, 0x7ffffffffb60): not implemented time/clock_nanosleep.c: In function 'main': time/clock_nanosleep.c:12:14: error: implicit declaration of function 'clock_nanosleep' [-Werror=implicit-function-declaration] 12 | if ( clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &now, NULL) < 0 ) | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors