Just add <sys/errno.h> at the beginning like:#pragma once   #include <sys/errno.h> #include <string>   #include "lwip/udp.h"<sys/errno.h> define ENOTSUP and more(169) #define ENOTSUP 134 /* Not supported */

Hi , i use the next code, with "placement new", with board STM32H745ZI.#include <new>   //BANK SRAM4 #define MEMORY_SHARED_INIT_ADDRESS 0x38000000   volatile void *pointerShared = (void *) MEMORY_SHARED_INIT_ADDRESS;   MemoryShared *memoryShared = ne...