squid-2.6.STABLE4 Sep 23 2006 Changelog: http://www.squid-cache.org/Versions/v2/2.6/changesets/SQUID_2_6_STABLE4.html
fixed in cvs. I also removed --enable-truncate because: a) it fails to compile b) author says the perfomance difference is marginal and it may lead into problems (see http://marc.theaimsgroup.com/?l=squid-users&m=115168297518054&w=2) WARNING: The transparent mode doesn't allow you to set vhost or vport, but it works as expected.