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When the Ubuntu package `libwxgtk3-dev` is not installed, FindwxWidgets succeeds even the required libraries are not actually found. The reason for that is that `wx-config` does not perform any kind of check and uses hard-coded values. This affects e.g. KiCAD build process and makes it fail with a confusing error message [1]. The solution is to check for presence of every library file obtained from `wx-config`. [1] https://bugs.launchpad.net/kicad/+bug/1630020
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