Install libao-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libao-dev
Description:
Cross Platform Audio Output Library Development
Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms. It currently supports: . * Null output (handy for testing without a sound device) * WAV files * AU files * OSS (Open Sound System, used on Linux and FreeBSD) * ALSA (Advanced Linux Sound Architecture) * PulseAudio (next generation GNOME sound server) * and several others. . This package contains the header files and static libraries required for developing applications that use libao.
Homepage: http://www.xiph.org/ao/
Version: 1.2.2+20180113-1ubuntu1
Section: libdevel