zbackup v1.2 (new formula)

zbackup is a globally-deduplicating backup tool, based on the ideas found in rsync.

Closes Homebrew/legacy-homebrew#23072.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/zbackup.rb

@@ -0,0 +1,19 @@
+require 'formula'
+
+class Zbackup < Formula
+  homepage 'http://zbackup.org'
+  url 'https://github.com/zbackup/zbackup/archive/1.2.tar.gz'
+  sha1 'e87dfaeeeea0d59f4af00d3ce248aaabf1a25cb9'
+
+  option 'with-brewed-openssl', 'Build with Homebrew OpenSSL instead of the system version'
+
+  depends_on 'cmake' => :build
+  depends_on 'openssl' if MacOS.version <= :leopard or build.with? 'brewed-openssl'
+  depends_on 'protobuf'
+  depends_on 'xz' # get liblzma compression algorithm library from XZutils
+
+  def install
+    system "cmake", ".", *std_cmake_args
+    system "make", "install"
+  end
+end