--- boost/asio/ssl/detail/engine.hpp	2012-03-10 22:52:20.000000000 +0100
+++ /opt/local/include/boost/asio/ssl/detail/engine.hpp	2013-01-06 01:18:09.000000000 +0100
@@ -94,7 +94,7 @@
       boost::system::error_code& ec, std::size_t& bytes_transferred);
 
   // Get output data to be written to the transport.
-  BOOST_ASIO_DECL boost::asio::mutable_buffers_1 get_output(
+  BOOST_ASIO_DECL boost::asio::const_buffers_1 get_output(
       const boost::asio::mutable_buffer& data);
 
   // Put input data that was read from the transport.
--- boost/asio/ssl/detail/impl/engine.ipp	2013-01-06 13:53:46.000000000 +0100
+++ /opt/local/include/boost/asio/ssl/detail/impl/engine.ipp	2013-01-06 01:19:40.000000000 +0100
@@ -162,14 +161,14 @@
       boost::asio::buffer_size(data), ec, &bytes_transferred);
 }
 
-boost::asio::mutable_buffers_1 engine::get_output(
+boost::asio::const_buffers_1 engine::get_output(
     const boost::asio::mutable_buffer& data)
 {
   int length = ::BIO_read(ext_bio_,
       boost::asio::buffer_cast<void*>(data),
-      static_cast<int>(boost::asio::buffer_size(data)));
+      boost::asio::buffer_size(data));
 
-  return boost::asio::buffer(data,
+  return boost::asio::buffer((const void*)boost::asio::buffer_cast<void*>(data),
       length > 0 ? static_cast<std::size_t>(length) : 0);
 }
 
@@ -178,7 +177,7 @@
 {
   int length = ::BIO_write(ext_bio_,
       boost::asio::buffer_cast<const void*>(data),
-      static_cast<int>(boost::asio::buffer_size(data)));
+      boost::asio::buffer_size(data));
 
   return boost::asio::buffer(data +
       (length > 0 ? static_cast<std::size_t>(length) : 0));