--- rstudio-1.2.1335-orig/src/cpp/core/include/core/http/TcpIpAsyncConnector.hpp	2019-03-28 16:08:20.000000000 +1100
+++ rstudio-1.2.1335/src/cpp/core/include/core/http/TcpIpAsyncConnector.hpp	2019-04-09 22:08:45.331273559 +1000
@@ -77,7 +77,13 @@
       {
          // start a timer that will cancel any outstanding asynchronous operations
          // when it elapses if the connection operation has not succeeded
-         pConnectionTimer_.reset(new boost::asio::deadline_timer(resolver_.get_io_service(), timeout));
+         pConnectionTimer_.reset(new boost::asio::deadline_timer(
+#if BOOST_VERSION >= 107000
+                                   resolver_.get_executor(),
+#else
+                                   resolver_.get_io_service(),
+#endif
+                                   timeout));
          pConnectionTimer_->async_wait(boost::bind(&TcpIpAsyncConnector::onConnectionTimeout,
                                                    TcpIpAsyncConnector::shared_from_this(),
                                                    boost::asio::placeholders::error));