Hi, Yuri -- I understand that you maintain the png++ "C++ wrapper for libpng"? There's a game engine I'm trying to work with on my 12-stable system, called Drag[en]gine. https://dragondreams.ch/ It's a complicated port, and I'll end up tweaking some heavy-duty OpenGL graphics to get it to do stuff for me. The first issue is that our libpng16 library is missing a C++ call: png_access_version_number(), which causes its setup program (a Python script)to crash. I have both png and png++ installed and both libpng16.so and libpng16.a are present. I'm in the process of (also) installing it on my Ubuntu 18.04.4 machine. It hasn't given me this libpng16 issue. What do you think of this problem? Is this yours or is it the actual libpng library itself? -- Don Wilde **************************************************** * What is the Internet of Things but a system * * of systems including humans? * ****************************************************