Just a wild guess from reading the Unix::Syslog SYNOPSIS and EXAMPLES, but does this work for you? 
use warnings;
use strict;
use Unix::Syslog qw(:macros :subs);

# Open syslog channel
openlog('my-program.pl', LOG_PID, 3);

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In reply to Re: Numeric values required in Unix::Syslog? by toolic
in thread Numeric values required in Unix::Syslog? by spoovy

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