skype-call-recorder fails to link mentioning libpng and zlib

[Rotsor]

The error message is very hard to understand: http://hydra.nixos.org/build/5367741/nixlog/1/tail-reload

The underlying problem is that id3lib builds its own version of zlib, resulting in two different zlibs being linked together.

[Rotsor]

Can I convert an issue into a pull request?

I fixed the problem here:

https://github.com/Rotsor/nixpkgs/tree/skype-recorder

This makes id3lib aware of zlib already existing so it avoids building its own version.