cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_mman/msync.c -o sys_mman/msync -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
sys_mman/msync.c:11:35: error: ‘msync’ undeclared here (not in a function)
   11 | int (*foo)(void *, size_t, int) = msync;
      |                                   ^~~~~