gnu indent: where are the tabs?

[Rui Maciel]

I've just started looking into gnu indent and I'm having some trouble
making it format the source code using tabs. In the man pages it is
said that the -ut and -ts options could handle that but no matter how
I run indent, the source code still appears exactly like if it was run
with indent --no-tabs.

The result is as following:

int test(int param)
{
  if (param == 1))
    {
      printf ("error\n");
      return EXIT_SUCCESS;
    }
  return EXIT_SUCCESS;
}

Is gnu indent broken? What do I need to do to be able to format the
code with leading tabs? Something like:

int test(int param)
{
        if (param == 1))
        {
                printf ("error\n");
                return EXIT_SUCCESS;
        }
        return EXIT_SUCCESS;
}