mesos: don't use internal zookeeper on Yosemite.

Closes Homebrew/homebrew#32965.

Formula/mesos.rb

@@ -12,15 +12,23 @@ class Mesos < Formula
 
   depends_on :java => "1.7"
   depends_on :macos => :mountain_lion
-
   depends_on "maven" => :build
+  # Use our Zookeeper for Yosemite and not the one shipped with Mesos
+  # Remove with next release.
+  # See https://github.com/Homebrew/homebrew/issues/32965
+  depends_on "zookeeper" if MacOS.version == :yosemite
+
 
   def install
-    system "./configure", "--disable-debug",
-                           "--disable-dependency-tracking",
-                           "--disable-silent-rules",
-                           "--prefix=#{prefix}"
+    args = ["--prefix=#{prefix}",
+            "--disable-debug",
+            "--disable-dependency-tracking",
+            "--disable-silent-rules"
+           ]
 
+    args << "--with-zookeeper=#{Formula["zookeeper"].opt_prefix}" if MacOS.version == :yosemite
+
+    system "./configure", *args
     system "make"
     system "make", "install"
   end