The libpng library should be available three ways. I would try the first way, then work down to the others. libpng16 is the latest version at the moment.
sudo apt-get install libpng16-16
sudo dpkg -i libpng16-16_1.6.26-6_amd64.deb
or from source at [
sourceforge.net] , then build with
./configure
make check
make install
ldconfig
