cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/pthread_cancel.c -o pthread/pthread_cancel -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
pthread/pthread_cancel.c:5:25: error: ‘pthread_cancel’ undeclared here (not in a function); did you mean ‘pthread_once’?
    5 | int (*foo)(pthread_t) = pthread_cancel;
      |                         ^~~~~~~~~~~~~~
      |                         pthread_once