Files are missing in libapache2-mod-perl2 that are present in mod_perl-2.0.9 on cpan, and are needed (Apache::SizeLimit::Core is called from Apache2::SizeLimit)

libapache2-mod-perl2 contents

dpkg-query -L libapache2-mod-perl2 | grep '\/Apache\/'
/usr/lib/perl5/Apache/TestRun.pm
/usr/lib/perl5/Apache/TestClient.pm
/usr/lib/perl5/Apache/TestMM.pm
/usr/lib/perl5/Apache/TestCommonPost.pm
/usr/lib/perl5/Apache/TestConfigParrot.pm
/usr/lib/perl5/Apache/TestRunPHP.pm
/usr/lib/perl5/Apache/Test.pm
/usr/lib/perl5/Apache/TestConfigC.pm
/usr/lib/perl5/Apache/TestServer.pm
/usr/lib/perl5/Apache/TestReportPerl.pm
/usr/lib/perl5/Apache/TestConfig.pm
/usr/lib/perl5/Apache/TestConfigPerl.pm
/usr/lib/perl5/Apache/TestHarness.pm
/usr/lib/perl5/Apache/TestUtil.pm
/usr/lib/perl5/Apache/TestSmoke.pm
/usr/lib/perl5/Apache/TestTrace.pm
/usr/lib/perl5/Apache/TestCommon.pm
/usr/lib/perl5/Apache/TestSmokePerl.pm
/usr/lib/perl5/Apache/TestConfigParse.pm
/usr/lib/perl5/Apache/TestConfigPHP.pm
/usr/lib/perl5/Apache/Test5005compat.pm
/usr/lib/perl5/Apache/TestBuild.pm
/usr/lib/perl5/Apache/TestMB.pm
/usr/lib/perl5/Apache/TestPerlDB.pm
/usr/lib/perl5/Apache/TestRequest.pm
/usr/lib/perl5/Apache/TestHandler.pm
/usr/lib/perl5/Apache/TestRunParrot.pm
/usr/lib/perl5/Apache/TestHarnessPHP.pm
/usr/lib/perl5/Apache/TestRunPerl.pm
/usr/lib/perl5/Apache/TestReport.pm
/usr/lib/perl5/Apache/TestSSLCA.pm
/usr/lib/perl5/Apache/TestSort.pm

mod_perl-2.0.9 cpan contents

perl Makefile.PL && make && find blib/lib -type f | grep '\/Apache\/'
blib/lib/Apache/.exists
blib/lib/Apache/Reload.pm
blib/lib/Apache/SizeLimit/Core.pm
blib/lib/Apache/SizeLimit.pm
blib/lib/Apache/Test.pm
blib/lib/Apache/Test5005compat.pm
blib/lib/Apache/TestBuild.pm
blib/lib/Apache/TestClient.pm
blib/lib/Apache/TestCommon.pm
blib/lib/Apache/TestCommonPost.pm
blib/lib/Apache/TestConfig.pm
blib/lib/Apache/TestConfigC.pm
blib/lib/Apache/TestConfigPHP.pm
blib/lib/Apache/TestConfigParrot.pm
blib/lib/Apache/TestConfigParse.pm
blib/lib/Apache/TestConfigPerl.pm
blib/lib/Apache/TestHandler.pm
blib/lib/Apache/TestHarness.pm
blib/lib/Apache/TestHarnessPHP.pm
blib/lib/Apache/TestMB.pm
blib/lib/Apache/TestMM.pm
blib/lib/Apache/TestPerlDB.pm
blib/lib/Apache/TestReport.pm
blib/lib/Apache/TestReportPerl.pm
blib/lib/Apache/TestRequest.pm
blib/lib/Apache/TestRun.pm
blib/lib/Apache/TestRunPHP.pm
blib/lib/Apache/TestRunParrot.pm
blib/lib/Apache/TestRunPerl.pm
blib/lib/Apache/TestSSLCA.pm
blib/lib/Apache/TestServer.pm
blib/lib/Apache/TestSmoke.pm
blib/lib/Apache/TestSmokePerl.pm
blib/lib/Apache/TestSort.pm
blib/lib/Apache/TestTrace.pm
blib/lib/Apache/TestUtil.pm
blib/lib/auto/Apache/Test/.exists

Note we are running ubuntu precise, so we have the 2.0.5 package installed -- http://packages.ubuntu.com/search?keywords=libapache2-mod-perl2