After perl upgrade: "Can't locate XML/Parser.pm in @INC"

[Niklaas Baudet von Gersdorff]

I upgraded perl and afterwards I got 

  Can't locate XML/Parser.pm in @INC

when executing some munin plugin:

  Can't locate XML/Parser.pm in @INC (you may need to install the
  XML::Parser module) (@INC contains:
  /usr/local/lib/perl5/site_perl/mach/5.20
  /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/5.20/mach
  /usr/local/lib/perl5/5.20 /usr/local/lib/perl5/site_perl/5.20
  /usr/local/lib/perl5/site_perl/5.20/mach .) at
  /usr/local/etc/munin/plugins/varnish4_bad line 99.

But it's there:

  $ pkg info | grep ^p5- | grep -i parser

  p5-HTML-Parser-3.72            Perl5 module for parsing HTML documents
  p5-TimeDate-2.30_2,1           Perl5 module containing a better/faster date parser for absolute dates
  p5-XML-Parser-2.44             Perl extension interface to James Clark's XML parser, expat

  $ find /usr/local/lib/perl5/ -iname parser

  /usr/local/lib/perl5/5.20/TAP/Parser
  /usr/local/lib/perl5/site_perl/mach/5.20/auto/HTML/Parser
  /usr/local/lib/perl5/site_perl/mach/5.24/auto/XML/Parser
  /usr/local/lib/perl5/site_perl/mach/5.24/XML/Parser
  /usr/local/lib/perl5/5.24/TAP/Parser

  $ pkg info | grep ^perl

  perl5-5.20.3_15                Practical Extraction and Report Language
  perl5.24-5.24.1.r4             Practical Extraction and Report Language

Did I miss something when upgrading perl?

    Niklaas