cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_mman/posix_typed_mem_open.c -o sys_mman/posix_typed_mem_open -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
sys_mman/posix_typed_mem_open.c:6:38: error: 'posix_typed_mem_open' undeclared here (not in a function)
 int (*foo)(const char *, int, int) = posix_typed_mem_open;
                                      ^~~~~~~~~~~~~~~~~~~~