zpaq 6.49

Closes Homebrew/homebrew#26625.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/zpaq.rb

@@ -0,0 +1,26 @@
+require "formula"
+
+class Zpaq < Formula
+  homepage "http://mattmahoney.net/dc/zpaq.html"
+  url "http://mattmahoney.net/dc/zpaq649.zip"
+  sha1 "aa0d8241679f314d0be8a43e7a87e5b4d4529017"
+  version "6.49"
+
+  def install
+    ENV.append_to_cflags "-Dunix -O3"
+    system "make", "libzpaq.o", "divsufsort.o", "zpaq.o"
+    system "ar", "-r", "libzpaq.a", "libzpaq.o", "divsufsort.o"
+    system ENV.cxx, "-o", "zpaq", "libzpaq.a", "zpaq.o"
+    lib.install "libzpaq.a"
+    include.install "libzpaq.h"
+    bin.install "zpaq"
+  end
+
+  test do
+    archive = testpath/'test.zpaq'
+    zpaq = bin/"zpaq"
+    system zpaq, "a", archive, "#{include}/libzpaq.h"
+    system zpaq, "t", archive
+    archive.read(4) == "7kSt"
+  end
+end