Bug#774073: dh-make-perl: Ceating core module, install fails with "trying to overwrite foo which is also in bar"

[Andrew Beverley]

On Sun, 2014-12-28 at 14:51 +0200, Niko Tyni wrote:
> A more robust solution is using dpkg-divert in maintainer scripts to move
> the core version out of the way and then back later if necessary. See
> for instance the libmodule-corelist-perl package for an example
> implementation.

Okay, attached is a revised patch that does exactly that.

It works (and it's taken me all day), but I admit that it's pretty
messy, so would welcome any feedback as to how to make this a little
tidier.

I figured that the dpkg-divert lines have to be generated during build,
otherwise it's not easily known which files will be installed.

Comments welcome!

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