Install libphonon4qt5experimental-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libphonon4qt5experimental-dev
multimedia framework from KDE using Qt 5 - experimental development files
Phonon is a Qt 5 multimedia API, which provides a task-oriented abstraction layer for capturing, mixing, processing, and playing audio and video content. . This package contains the development files needed to build Phonon back-ends or internal applications which need the Phonon-Experimental library. Third-party applications should not depend on this library. Please read README.Debian if you are considering a build-dependency on this package.