libwbxml 0.11.2 plus optional deps

- Upgrade to version 0.11.2
- Add an option to build the docs with Graphviz and Doxygen.
- Add an optional dep on wget

Closes Homebrew/homebrew#14765.

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

Formula/libwbxml.rb

@@ -2,14 +2,21 @@ require 'formula'
 
 class Libwbxml < Formula
   homepage 'https://libwbxml.opensync.org/'
-  url 'http://sourceforge.net/projects/libwbxml/files/libwbxml/0.10.8/libwbxml-0.10.8.tar.gz'
+  url 'http://sourceforge.net/projects/libwbxml/files/libwbxml/0.11.2/libwbxml-0.11.2.tar.bz2'
-  sha1 '7704cdf5952ff6916158bbc76aa919ceb1780957'
+  sha1 '0b4f526709cac75c4b261666950bd935dda9f0d4'
+
+  option 'docs', 'Build the documentation with Doxygen and Graphviz'
 
   depends_on 'cmake' => :build
+  depends_on 'wget' => :optional
+  depends_on 'doxygen' if build.include? 'docs'
+  depends_on 'graphviz' if build.include? 'docs'
 
   def install
     mkdir "build" do
-      system "cmake", "..", *std_cmake_args
+      args = std_cmake_args + %w[..]
+      args << '-DBUILD_DOCUMENTATION=ON' if build.include? 'docs'
+      system "cmake", *args
       system "make install"
     end
   end