Have tried following the dependency for: libmotif-dev → libxft-dev → libfontconfig1-dev → libfreetype6-dev → libpng-dev
where finally resolved by 'apt install libpng-dev' which removed an older installed packge, libpng16-dev and replaced with newer libpng12-dev
S. Kawaji, T. Maeda, and N. Matsunaga. IFAC Proceedings Volumes, 26 (2, Part 3):
535 - 540(1993)12th Triennal Wold Congress of the International Federation of Automatic control. Volume 3 Applications I, Sydney, Australia, 18-23 July.