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FindJack was not using _INCLUDE_DIRS and _LIBRARY_DIRS set by FindPkgConfig, which prevented it from locating the PipeWire version of libjack when it is installed to a non-standard path. In particular, this impacts Fedora Linux, which is the first distribution to have made the change to have all audio routed through PipeWire and eliminate the usage of PulseAudio and JACK by default. Reference: https://fedoraproject.org/wiki/Changes/DefaultPipeWire