How to unlist a package

[Olivier Nicole]

Hi,

I have installed a package (clamav-unofficial-sigs) and later found out
that the version from the developer has many fatures that I needed.

So I installed the original version directly from github, and the new
script lays in place of the package.

I am afraid that on the next package update, what I installed by hand
will be overwriten.

So how can I tell the package system that this very package is not
installed anymore, but without doing a delete?

Best regards,

Olivier
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