cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/sigwaitinfo.c -o signal/sigwaitinfo -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
signal/sigwaitinfo.c:5:61: error: ‘sigwaitinfo’ undeclared here (not in a function)
    5 | int (*foo)(const sigset_t *restrict, siginfo_t *restrict) = sigwaitinfo;
      |                                                             ^~~~~~~~~~~