Problem z alegro 5 Microsoft visual c++ 2010

include < allegro5 / allegro5.h >
#include<allegro5/allegro_native_dialog.h>

int main()
{
    ALLEGRO_DISPLAY * display;
   
    if( !al_init() )
    {
        al_show_native_message_box( NULL, NULL, NULL, "Could not initialize Allegro 5", NULL, NULL );
    }
   
    display = al_create_display( 800, 600 );
   
    if( !display )
    {
        al_show_native_message_box( NULL, NULL, NULL, "Could not Create allegro window", NULL, NULL );
    }
    return 0;
}