homebrew-core/Formula/pngcrush.rb

require "formula"

# Stay at least one version behind and use the old-versions directory, because
# tarballs are routinely removed and upstream won't change this practice.
class Pngcrush < Formula
  homepage "http://pmt.sourceforge.net/pngcrush/"
  url "https://downloads.sourceforge.net/project/pmt/pngcrush/1.7.76/pngcrush-1.7.76.tar.gz"
  sha1 "bfe29dc46196cef792ffaebf7349256dcc6e7017"

  def install
    # Required to successfully build the bundled zlib 1.2.6
    ENV.append_to_cflags "-DZ_SOLO"
    # Required to enable "-cc" (color counting) option (disabled by default since 1.5.1)
    ENV.append_to_cflags "-DPNGCRUSH_COUNT_COLORS"

    system "make", "CC=#{ENV.cc}",
                   "LD=#{ENV.cc}",
                   "CFLAGS=#{ENV.cflags}",
                   "LDFLAGS=#{ENV.ldflags}"
    bin.install "pngcrush"
  end
end