class Minizip < Formula
  desc "C library for zip/unzip via zLib"
  homepage "http://www.winimage.com/zLibDll/minizip.html"
  url "http://zlib.net/zlib-1.2.8.tar.gz"
  sha256 "36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d"
  version "1.1" # version for minizip, not zlib

  option :universal

  depends_on "autoconf" => :build
  depends_on "automake" => :build
  depends_on "libtool" => :build

  # configure script fails to detect the right compiler when "cc" is
  # clang, not gcc.
  # see: https://github.com/Homebrew/homebrew-dupes/pull/228
  #      https://github.com/madler/zlib/pull/54
  patch :DATA

  def install
    ENV.universal_binary if build.universal?
    system "./configure", "--prefix=#{prefix}"
    system "make"

    cd "contrib/minizip" do
      # edits to statically link to libz.a
      inreplace "Makefile.am" do |s|
        s.sub! "-L$(zlib_top_builddir)", "$(zlib_top_builddir)/libz.a"
        s.sub! "-version-info 1:0:0 -lz", "-version-info 1:0:0"
        s.sub! "libminizip.la -lz", "libminizip.la"
      end
      system "autoreconf", "-fi"
      system "./configure", "--prefix=#{prefix}"
      system "make", "install"
    end
  end

  def caveats
    <<-EOS.undent
      Minizip headers installed in 'minizip' subdirectory, since they conflict
      with the venerable 'unzip' library.
    EOS
  end
end

__END__
diff --git a/configure b/configure
index b77a8a8..54f33f7 100755
--- a/configure
+++ b/configure
@@ -159,6 +159,7 @@ case "$cc" in
 esac
 case `$cc -v 2>&1` in
   *gcc*) gcc=1 ;;
+  *clang*) gcc=1 ;;
 esac

 show $cc -c $test.c