Package upgrade: apache2-mod-perl
Seems a mod_perl release for newer apache2 2.4x is still in
development.
There is a httpd24 branch in mod_perl svn,
its reported to have worked but bugs may still be there.
Please have a look at it.
(from redmine: issue id 2244, created on 2013-09-02, closed on 2015-12-18)