Install Kwin effect/decoration (library used by other application)

I want to install kwin effects and decorations under Nixos. I already added custom packages and installed them successfully but those were all binaries with an executable not libraries needed by other applications. How can I do this properly with kwin seeing it?

Take a look at this:

It’s not upstream.

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If I want to install a kwin effect when I would execute make install it would also copy a file into the store path of an entirely different package (kdelibs4support).

As thus i get a “Maybe need administrative privileges” and the install fails.

How do I resolve this?

Take a look at the installPhase in the link I mentioned.