Per Perl::Critic::Policy::Subroutines::ProhibitUnusedPrivateSubroutines, adding something like this to your .perlcriticrc might suffice: 

    [Subroutines::ProhibitUnusedPrivateSubroutines]
    private_name_regex = _(?!build_)\w+

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In reply to Re: perlcritic and OO Perl (including Moose) idioms by Anonymous Monk
in thread perlcritic and OO Perl (including Moose) idioms by boftx

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