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Error from forum http://forum.piwik.org/read.php?2,74303
Warning: pack() has been disabled for security reasons in /srv/www/sbs-feintechnik.com/www2/htdocs/statistik/plugins/AnonymizeIP/AnonymizeIP.php on line 52
so, we should test that pack is enabled during install and throw a critical error if not
(In ) fixes #2246
(In ) pack() is actually required for Core as well (converts the hexadecimal id to binary) refs #2246