what other dependencies do I need to resolve?

Did you run make test after the perl Makefile.PL FORCE=1 PREFIX=/app/localapps/perl/lib step finished ?
You'll need to do that, and then run make install.

If you've done all of that and there were problems, then I'd be looking to make that failing 'xml2-config' command work.
Where is 'xml2-config' located ? Is it in '/app/localapps/perl/bin' ?

Could you post the output of perl -V (that's an uppercase 'V').

Cheers,
Rob