cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/pthread_kill.c -o signal/pthread_kill -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
signal/pthread_kill.c:5:30: error: ‘pthread_kill’ undeclared here (not in a function); did you mean ‘pthread_t’?
    5 | int (*foo)(pthread_t, int) = pthread_kill;
      |                              ^~~~~~~~~~~~
      |                              pthread_t