If I understand you correctly, you want to package your module in a way that an attempt to install it won't also automatically cause either Archive::Zip or Archive::SevenZip to be installed, unless neither is already installed.

From looking at http://search.cpan.org/~dagolden/CPAN-Meta-2.150005/lib/CPAN/Meta/Spec.pm, I think the best you can do is make both optional ("recomends"), then have a test to make sure one of those is available.

You might be able to add code to Makefile.PL before the line with WriteMakefile, but I don't know how you could then get either archiver installed from there. Maybe you could do system 'cpan Archive::Zip';

Update: Looked again and found 1140942. Seems it is possible to modify MakeFile.PL to munge the prereqs.

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