cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/sigtimedwait.c -o signal/sigtimedwait -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
signal/sigtimedwait.c:5:94: error: ‘sigtimedwait’ undeclared here (not in a function)
    5 | int (*foo)(const sigset_t *restrict, siginfo_t *restrict, const struct timespec *restrict) = sigtimedwait;
      |                                                                                              ^~~~~~~~~~~~