cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_mman/mlockall.c -o sys_mman/mlockall -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
sys_mman/mlockall.c:6:19: error: ‘mlockall’ undeclared here (not in a function)
    6 | int (*foo)(int) = mlockall;
      |                   ^~~~~~~~