Package: zopfli Version: 1.0.1+git160119-1 Zopfli come with a second executable, zopflipng which like (pngout, pngcrush and optipng) is used to optimize PNG image files.
As the Makefile doesn't implement the "install" target, and unlike zopfli, zopflipng isn't copied during build into the project root, but remains hidden in the src directory, it seems the package maintainer overlooked the existence of "zopflipng". All that would need to be done is adding following line to debian/zopfli.install: src/zopflipng /usr/bin/
