error: field ‘start’ has incomplete type

求教:error: field ‘start’ has incomplete typeC/C++ code#include stdio.h#include time.hstruct A{

求教:error: field ‘start’ has incomplete type

C/C++ code
#include <stdio.h>#include <time.h>struct A{    struct timeval start;};int main(int argc, char **argv){    printf("hello world\n");    return 0;}

error: field ‘start’ has incomplete type

[解决办法]
#include <sys/time.h>