cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_msg/msgrcv.c -o sys_msg/msgrcv -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
sys_msg/msgrcv.c:11:50: error: initialization of 'ssize_t (*)(int,  void *, size_t,  long int,  int)' {aka 'long int (*)(int,  void *, long unsigned int,  long int,  int)'} from incompatible pointer type 'int (*)(int,  void *, size_t,  long int,  int)' {aka 'int (*)(int,  void *, long unsigned int,  long int,  int)'} [-Werror=incompatible-pointer-types]
 ssize_t (*foo)(int, void *, size_t, long, int) = msgrcv;
                                                  ^~~~~~
cc1: all warnings being treated as errors