The current 3.20beta-4 now supports ipv6 on both 
Windows and Linux compatible platforms.

Please send me any feedback if you can test these 
releases on a v6 environment. I would also be 
interested by any information on other Unix 
implementations (location of headers, includes..) such 
as Solaris, FreeBSD..

Download beta at:
<http://www.httrack.com/page3.php>
Email me:
roche@httrack.com