cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_PC_TIMESTAMP_RESOLUTION.c -o unistd/_PC_TIMESTAMP_RESOLUTION -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
unistd/_PC_TIMESTAMP_RESOLUTION.c:2:17: error: use of undeclared identifier '_PC_TIMESTAMP_RESOLUTION'
    2 | int const foo = _PC_TIMESTAMP_RESOLUTION;
      |                 ^
1 error generated.