Install libreplaygain-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libreplaygain-dev
Description:
Calculate ReplayGain information - development files
libreplaygain calculates the perceived loudness of audio and suggests dB adjustments according to the ReplayGain standard. . This package contains the header files, static libraries and symbolic links that developers using libreplaygain will need.
Homepage: http://www.replaygain.org
Version: 1.0~r475-1
Section: universe/libdevel