pure 0.64

Fixes Homebrew/homebrew#34648.

Formula/pure.rb

@@ -1,9 +1,9 @@
-require 'formula'
+require "formula"
 
 class Pure < Formula
-  homepage 'http://purelang.bitbucket.org/'
-  url 'https://bitbucket.org/purelang/pure-lang/downloads/pure-0.60.tar.gz'
-  sha1 'ef930868e8ba2b8e1a65c782d8b04828c3d0d255'
+  homepage "http://purelang.bitbucket.org/"
+  url "https://bitbucket.org/purelang/pure-lang/downloads/pure-0.64.tar.gz"
+  sha1 "738d25de30a20bbdd0722aeb923d6be9051b730f"
 
   bottle do
     sha1 "75cfcd8adf10e49d2d1d8277c74ec2151b2047a5" => :mavericks
@@ -11,24 +11,29 @@ class Pure < Formula
     sha1 "f8fd5804cdf52cb45321fedeb5d4ba42a219a08d" => :lion
   end
 
-  depends_on 'llvm'
-  depends_on 'gmp'
-  depends_on 'readline'
-  depends_on 'mpfr'
+  needs :cxx11
 
-  resource 'docs' do
-    url 'https://bitbucket.org/purelang/pure-lang/downloads/pure-docs-0.60.tar.gz'
-    sha1 '6a5644bc674db8a481c7db5181cf44d6be590645'
+  depends_on "llvm"
+  depends_on "gmp"
+  depends_on "readline"
+  depends_on "mpfr"
+
+  resource "docs" do
+    url "https://bitbucket.org/purelang/pure-lang/downloads/pure-docs-0.64.tar.gz"
+    sha1 "a7cea453195046621497be5ea1d33dce3cb677cc"
   end
 
   def install
+    ENV.cxx11
+
     system "./configure", "--disable-debug",
                           "--prefix=#{prefix}",
                           "--enable-release",
                           "--without-elisp"
+
     system "make"
-    system "make install"
-    resource('docs').stage { system "make", "prefix=#{prefix}", "install" }
+    system "make", "install"
+    resource("docs").stage { system "make", "prefix=#{prefix}", "install" }
   end
 
   test do