Table of Contents

libpng12.so.0

wget https://github.com/glennrp/libpng/archive/v1.2.59.tar.gz
tar xvfz v1.2.59.tar.gz 
cd libpng-1.2.59/
./configure
make check
sudo make install
cp ./libpng-1.2.59/.libs/libpng12.so.0.59.0 ./lib/libpng12.so.0

Qt4 on Ubuntu 2x.xx

sudo add-apt-repository ppa:rock-core/qt4
sudo sed -i 's/impish/focal/g' /etc/apt/sources.list.d/rock-core-ubuntu-qt4-impish.list
sudo apt-get update
sudo apt-get install libqtwebkit4