This document is prepared for Kubuntu and KDE Neon Linux distributions,
but will probably work on any Debian or Ubuntu based Linux distribution.

Install the required dependencies
sudo apt-get install build-essential
sudo apt-get install libfftw3-bin libfftw3-dev
sudo apt-get install libportaudio2 portaudio19-dev libportaudiocpp0
sudo apt-get install libpulse-dev
sudo apt-get install libsndfile1-dev
sudo apt-get install libglu1-mesa-dev freeglut3 freeglut3-dev mesa-common-dev
sudo apt-get install cmake ninja-build
sudo apt-get install libmpg123-dev
sudo apt-get install libboost-all-dev

Download Qt Online Installer from https://www.qt.io
Install the latest version of Qt using Qt Online Installer

Donwnload the source codes (autotools version) of
libopenmpt release 0.6.0 or above from https://lib.openmpt.org/libopenmpt

Extract libopenmpt source codes to home folder
cd <libopenmpt source codes folder>
./configure
make
make install

Now you can clone and build ModPlug Player.
Change your working directory to your home folder
cd ~
Clone latest tagged version of Modplug Player (Alpha5 as example)
git clone –branch Alpha5 –recurse-submodules https://github.com/ModPlugPlayer/ModPlugPlayer.git ModPlugPlayer
or
git clone –branch Alpha5 –recurse-submodules https://git.code.sf.net/p/modplugplayer/ModPlugPlayer ModPlugPlayer

Create ModPlug Player build directory in your home folder
mkdir ~/MPPBinary
cd ~/ModPlugPlayer

Configure ModPlug Player
Check your Qt version by looking at the Qt folder in your home folder,
then replace 6.2.3 with your Qt version on the line below.
cmake -B ../MPPBinary -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=~/Qt/6.2.3/gcc_64

Build ModPlug Player
cd ~/MPPBinary
cmake –build ../MPPBinary –config Release

Now you can find ModPlug Player executable binary file under ~/MPPBinary folder.