cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_CS_POSIX_V8_THREADS_CFLAGS.c -o unistd/_CS_POSIX_V8_THREADS_CFLAGS -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
unistd/_CS_POSIX_V8_THREADS_CFLAGS.c:2:17: error: '_CS_POSIX_V8_THREADS_CFLAGS' undeclared here (not in a function)
    2 | int const foo = _CS_POSIX_V8_THREADS_CFLAGS;
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~