Install libsdl2-mixer-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libsdl2-mixer-dev
Description:
Mixer library for Simple DirectMedia Layer 2, development files
SDL_mixer is a sample multi-channel audio mixer library. It supports any number of simultaneously playing channels of 16 bit stereo audio, plus a single channel of music, mixed by the popular FLAC, modplug MOD, FluidSynth and Timidity MIDI, Ogg Vorbis, and MAD or SMPEG MP3 libraries. . This package contains the development files.
Homepage: http://www.libsdl.org/projects/SDL_mixer/
Version: 2.0.2+dfsg1-2
Section: universe/libdevel