File missing-include.patch of Package rstudio

diff --git a/src/cpp/core/include/core/Thread.hpp b/src/cpp/core/include/core/Thread.hpp
index 9ca7f33..df3a0ad 100644
--- a/src/cpp/core/include/core/Thread.hpp
+++ b/src/cpp/core/include/core/Thread.hpp
@@ -17,6 +17,7 @@
 #define CORE_THREAD_HPP
 
 #include <queue>
+#include <set>
 
 #include <boost/utility.hpp>
 #include <boost/function.hpp>