cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_mman/mlock.c -o sys_mman/mlock -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
sys_mman/mlock.c:6:36: error: ‘mlock’ undeclared here (not in a function)
    6 | int (*foo)(const void *, size_t) = mlock;
      |                                    ^~~~~