cc -O2 -pipe  -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 
sys_mman/posix_typed_mem_open.c:6:38: error: use of undeclared identifier 'posix_typed_mem_open'
int (*foo)(const char *, int, int) = posix_typed_mem_open;
                                     ^
1 error generated.