cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/pthread_cleanup_pop.c -o pthread/pthread_cleanup_pop -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
pthread/pthread_cleanup_pop.c:3:20: error: ‘pthread_cleanup_pop’ undeclared here (not in a function)
    3 | void (*foo)(int) = pthread_cleanup_pop;
      |                    ^~~~~~~~~~~~~~~~~~~