C99 format specifiers

The following code causes a syntax error:

#include <stdio.h>
#include <inttypes.h>

int main(void)
{
    uint64_t i = 4;
    printf("output: %"PRIu64" \n", i);
    return 0;
}

This is a MinGW specific problem (works under Linux), since these constants are only defined in MinGW's inttypes.h when __cplusplus is not defined.