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  -liconv
signal/sigtimedwait.c:5:72: error: declaration of 'struct timespec' will not be visible outside of this function [-Werror,-Wvisibility]
    5 | int (*foo)(const sigset_t *restrict, siginfo_t *restrict, const struct timespec *restrict) = sigtimedwait;
      |                                                                        ^
signal/sigtimedwait.c:5:94: error: use of undeclared identifier 'sigtimedwait'
    5 | int (*foo)(const sigset_t *restrict, siginfo_t *restrict, const struct timespec *restrict) = sigtimedwait;
      |                                                                                              ^
2 errors generated.