require 'formula' class Pngcheck < Formula homepage 'http://www.libpng.org/pub/png/apps/pngcheck.html' url 'http://downloads.sourceforge.net/project/png-mng/pngcheck/2.3.0/pngcheck-2.3.0.tar.gz' sha1 'e7f1535abbf2f809e036a9a43c759eeac5e39350' def install system 'make pngcheck' bin.install 'pngcheck' end end