Help Audio::Ao XS/C - Segfaults on i686

Hi Guys,

I've been using Audio::Ao 
(http://search.cpan.org/~dbp/Audio-Ao-0.01/Ao.pm) for some weeks and 
it's great.

It's an interface to the libao library (http://xiph.org/ao/)

However, until today I have only used it on Linux x64 (Fedora 14), I 
compiled it on i686 (Fedora 14) and it segfaults when I call the 
open_live() function.

I created a clean F14 VM and get the same results as the i686 machine.

The other functions/methods appear to work and return the corrected data 
from the library.

I do not understand C or XS and am incapable of fixing this issue myself 
and was hoping someone could help resolve this problem as the Author is 
AWAL :(

I'm pretty sure the bug is in the C/XS code:

Also: You are also supposed to be able to pass some optional parameters 
to the open_live function, but if you pass anything other than an empty 
hash ref (e.g. {}) it always segfaults :(, it would be nice to know why 
that does not work as it should, but that is secondary.

To clarify, this works on x64, but _not_ on i686, but in both causes it 
compiles fine.

The C/XS code is:

SV *open_live (	int id, int bits, int rate, int channels, int bform, 
void *o)
{
	ao_option *opstruct = NULL;
	ao_sample_format format;
	ao_device *device;
	SV *hval;
	HV *options;
	char **hkey;
	I32 *retlen;
	int ops = 0;
	
	if (o != NULL)
		options = (HV *) o;
	else
		options = newHV();

	hv_iterinit(options);
	while ((hval = hv_iternextsv(options, hkey, retlen)) != NULL) {
		ops = 1;
		if (ao_append_option(&opstruct, *hkey, SvPV_nolen(hval)) != 1) {
			perror("Bad value in options hash, aborting open_live");
			return &PL_sv_undef;
		}
	}

	format.bits = bits;
	format.rate = rate;
	format.channels = channels;
	format.byte_format = bform;

	if (ops > 0)
		device = (ao_device *) ao_open_live(id, &format, opstruct);
	else
		device = (ao_device *) ao_open_live(id, &format, NULL);

	ao_free_options(opstruct);
	
	return newSViv((IV) device);
}


NOTE: The same issue exists with the open_file() function, so I assume 
that is the same problem, as they are almost identical functions.

Thanks in advance

Albert