cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_wait/WNOWAIT.c -o sys_wait/WNOWAIT -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv
sys_wait/WNOWAIT.c:2:17: error: ‘WNOWAIT’ undeclared here (not in a function)
    2 | int const foo = WNOWAIT;
      |                 ^~~~~~~