cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_POSIX_TIMESTAMP_RESOLUTION.c -o unistd/_POSIX_TIMESTAMP_RESOLUTION -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
unistd/_POSIX_TIMESTAMP_RESOLUTION.c:3:17: error: '_POSIX_TIMESTAMP_RESOLUTION' undeclared here (not in a function)
 int const foo = _POSIX_TIMESTAMP_RESOLUTION;
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~