Cannot set up dev environment on Debian

[AnOnlooker]

I'm following the the Wiki https://wiki.openmw.org/index.php?title ... and_Ubuntu. I start with running the command

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sudo add-apt-repository ppa:openmw/openmw

The response includes two warnings:

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gpg: WARNING: "--secret-keyring" is an obsolete option - it has no effect
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
gpg: no valid OpenPGP data found.

When I proceed with the next step (sudo apt install libopenscenegraph-dev), I get the error:

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Package libopenscenegraph-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source.
E: Package 'libopenscenegraph-dev' has no installation candidate

I am on the Debian Testing channel, by the way.

Is there another way to install OpenMW dev env on Debian?

[psi29a]

The ppa is for Ububtu only, including this on your Debian machine will not end well.

If you're using Debian, the existing testing packages should be enough.

[AnOnlooker]

OK, I've installed all dependencies except libopenscenegraph-dev. It still says that this package has no installation candidate. I've run apt-get update, of course.