>make clean && make install не помогло:
/usr/ports/www/squid/>sudo make clean && make install
===> Cleaning for perl-5.8.8
===> Cleaning for squid-2.6.12
===> Vulnerability check disabled, database not found
===> Found saved configuration for squid-2.6.12
=> squid-2.6.STABLE12.tar.bz2 is not in /usr/ports/www/squid/distinfo.
=> Either /usr/ports/www/squid/distinfo is out of date, or
=> squid-2.6.STABLE12.tar.bz2 is spelled incorrectly.
*** Error code 1
Stop in /usr/ports/www/squid.
*** Error code 1
Stop in /usr/ports/www/squid.
/usr/ports/www/squid/>