groonga 3.1.1

Closes Homebrew/homebrew#25534.

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

Formula/groonga.rb

@@ -2,18 +2,30 @@ require 'formula'
 
 class Groonga < Formula
   homepage 'http://groonga.org/'
-  url 'http://packages.groonga.org/source/groonga/groonga-3.1.0.tar.gz'
-  sha1 '7d4ad3be8ade2b97ccf6790063b2b08d111daa59'
+  url 'http://packages.groonga.org/source/groonga/groonga-3.1.1.tar.gz'
+  sha1 '94f008c2b598e9d1e98a4c7a8b6115cc65c7367d'
 
   depends_on 'pkg-config' => :build
   depends_on 'pcre'
   depends_on 'msgpack'
 
+  depends_on 'glib' if build.include? 'enable-benchmark'
+
+  option 'enable-benchmark', "Enable benchmark program for developer use"
+
   def install
+    args = %W[
+      --prefix=#{prefix}
+      --with-zlib
+      --disable-zeromq
+    ]
+
+    if build.include? 'enable-benchmark'
+      args << '--enable-benchmark'
+    end
+
     # ZeroMQ is an optional dependency that will be auto-detected unless we disable it
-    system "./configure", "--prefix=#{prefix}",
-                          "--with-zlib",
-                          "--disable-zeromq"
+    system "./configure", *args
     system "make install"
   end
 end