Ubuntu 20.04 installation bash shell file for installing all of libsubtractive's prerequisites and dependencies as well as libsubtractive itself. You should be able to #include <libsubtractive/libsubtractive.hpp> in your c++ source files after this installation is completed.

ls_ubuntu-2004.sh

#!/bin/bash
# Script:		Libsubtractive Installation Script
# OS:			Ubuntu 20.04
# Updated:		11.17.20
# Author:		Eric Brown
####################################################
# Usage:
# chmod u+x ls_ubuntu-2004.sh
# ./ls_ubuntu-2004.sh
####################################################

# Setup
cd ~
echo -e '\e[1;33m> Checking if Lupin software directory exists.\e[0m'
if [ ! -d Lupin ]; then
  echo -e '\e[1;33m> Creating Lupin software directory.\e[0m'
  mkdir -p Lupin && cd Lupin
else
  echo -e '\e[1;31m> Lupin software directory already exists.\e[0m'
  echo -e '\e[1;31m> Would you like to remove and reinstall the Lupin software directory?\e[0m [y/n]'
    read yn
    if [[ $yn == y* ]]; then
        echo -e '\e[1;33m> User selected to reinstall. Removing Lupin software directory and reinstalling.\e[0m'
        sudo rm -rf Lupin 
		mkdir -p Lupin && cd Lupin
    else
    	echo -e '\e[1;31m> User selected not to reinstall. Exiting.\e[0m'	
    	exit 1
    fi
fi

# Update System -- Install Prerequisites
echo -e '\e[1;33m> Updating system.\e[0m'
sudo apt update && sudo apt upgrade -y && sudo apt dist-upgrade -y
echo -e '\e[1;33m> Installing Lupin prerequisites.\e[0m'
sudo apt install -y curl unzip tar cmake gcc g++ pkg-config libudev-dev scons build-essential libssl-dev binutils-dev libiberty-dev libmariadb-dev-compat libleveldb-dev libsnappy-dev git libboost-all-dev qt5-default libqt5websockets5-dev libqt5opengl5-dev libnode-dev
pkgs='curl unzip tar cmake gcc g++ pkg-config libudev-dev scons build-essential libssl-dev binutils-dev libiberty-dev libmariadb-dev-compat libleveldb-dev libsnappy-dev git libboost-all-dev qt5-default libqt5websockets5-dev libqt5opengl5-dev libnode-dev'
if ! dpkg -s $pkgs >/dev/null 2>&1; then
    echo -e '\e[1;31m> [ERROR] Installation of prerequisites failed. Exiting.\e[0m'
    exit 1
else
    echo -e '\e[1;32m> [SUCCESS] Installation of prerequisites successful.\e[0m'
fi

# GTest / GMock
echo -e '\e[1;33m> Installing GTest and GMock.\e[0m'
git clone https://github.com/google/googletest.git
cd googletest
mkdir build && cd build
cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_SHARED_LIBS=ON -DBUILD_GMOCK=ON -DINSTALL_GTEST=ON ..
make
sudo make install
sudo ldconfig
cd ..
cd ..
echo -e '\e[1;33m> Checking for GTest.\e[0m'
pkgs='gtest'
if ! ldconfig -p | grep $pkgs >/dev/null 2>&1; then
  echo -e '\e[1;31m> [ERROR] Installation of GTest failed. Cannot find library directory. Exiting.\e[0m'
  exit 1
else
  echo -e '\e[1;32m> [SUCCESS] Installation of GTest successful.\e[0m'
fi
echo -e '\e[1;33m> Checking for GMock.\e[0m'
pkgs='gmock'
if ! ldconfig -p | grep $pkgs >/dev/null 2>&1; then
  echo -e '\e[1;31m> [ERROR] Installation of GMock failed. Cannot find library directory. Exiting.\e[0m'
  exit 1
else
  echo -e '\e[1;32m> [SUCCESS] Installation of GMock successful.\e[0m'
fi

# ZeroMQ
echo -e '\e[1;33m> Installing ZeroMQ.\e[0m'
git clone https://github.com/zeromq/libzmq.git
cd libzmq
./autogen.sh
./configure
make
sudo make install
sudo ldconfig
cd ..
echo -e '\e[1;33m> Checking for ZeroMQ.\e[0m'
pkgs='zmq'
if ! ldconfig -p | grep $pkgs >/dev/null 2>&1; then
  echo -e '\e[1;31m> [ERROR] Installation of ZeroMQ failed. Cannot find library directory. Exiting.\e[0m'
  exit 1
else
  echo -e '\e[1;32m> [SUCCESS] Installation of ZeroMQ successful.\e[0m'
fi

# libusbp
echo -e '\e[1;33m> Installing libusbp.\e[0m'
git clone https://github.com/pololu/libusbp.git
cd libusbp
mkdir build && cd build
cmake ..
make
sudo make install
sudo ldconfig
cd ..
cd ..
echo -e '\e[1;33m> Checking for libusbp.\e[0m'
pkgs='libusbp'
if ! ldconfig -p | grep $pkgs >/dev/null 2>&1; then
  echo -e '\e[1;31m> [ERROR] Installation of libusbp failed. Cannot find library directory. Exiting.\e[0m'
  exit 1
else
  echo -e '\e[1;32m> [SUCCESS] Installation of libusbp successful.\e[0m'
fi

# libsubtractive
echo -e '\e[1;33m> Installing libsubtractive.\e[0m'
git clone https://github.com/ericlancebrown/libsubtractive.git
cd libsubtractive
mkdir build && cd build
cmake ..
make
sudo make install
sudo ldconfig
cd ..
cd ..
echo -e '\e[1;33m> Checking for libsubtractive.\e[0m'
pkgs='libsubtractive'
if ! ldconfig -p | grep $pkgs >/dev/null 2>&1; then
  echo -e '\e[1;31m> [ERROR] Installation of libsubtractive failed. Cannot find library directory. Exiting.\e[0m'
  exit 1
else
  echo -e '\e[1;32m> [SUCCESS] Installation of libsubtractive successful.\e[0m'
fi
  echo -e '\e[1;32m> [COMPLETE] Installation of libsubtractive library and dependencies complete.\e[0m'