Oh, that seems to be priceless.
I really love closed-source linux programs, too... I am sure it runs, it just won't be packaged by anybody.
Is pngout actually being used? It probably isn't necessary, how many different png optimizers does one program need?
But assuming we want to squeeze every possible byte out, a noteworthy goal, perhaps it is a better idea to use zopflipng which is part of google's open-source zopfli compression engine (alternative to deflate, it takes 2-3 times longer in order to find the smallest compression path). It even claims to be marginally better than pngout, by a whole 0.5%
https://code.google.com/p/zopfli/sou...ADME.zopflipng