Getting the current configuration into a form useful for a new configuration is easy enough:

    /path/to/current/perl -V':.*' | sed -e 's/^/-D/'
[download]

This will pick up all of the current configuration options, though, including several you won't want. Library path, API-level settings, etc. that are specific to 5.6.0. So I'd use an exclusionary grep:

    perl -V':.*' | egrep -v '(^PERL_|^api_|5\.6\.0)' | sed -e 's/^/-D/
+'
[download]

What I don't know is whether you can backtick-feed that Configure on a command line like so:

    Configure `perl -V':.*' | egrep -v '(^PERL_|^api_|5\.6\.0)' | sed 
+-e 's/^/-D/'`
[download]

I went through the README, INSTALL and such in the latest source distribution, but I couldn't find a way to feed Configure from a file other than config.sh or Policy.sh. And as I pointed out earlier, you don't want to use all of the elements that would be in config.sh.

--rjray