/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra timespec_get.c -o timespec_get -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -latomic
timespec_get.c:10:15: warning: call to undeclared function 'timespec_get'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        int result = timespec_get(&ts, TIME_UTC);
                     ^
timespec_get.c:10:33: error: use of undeclared identifier 'TIME_UTC'
        int result = timespec_get(&ts, TIME_UTC);
                                       ^
timespec_get.c:13:17: error: use of undeclared identifier 'TIME_UTC'
        if ( result != TIME_UTC )
                       ^
1 warning and 2 errors generated.