Add (c) header.

interpreter/cling/tools/demo/CMakeLists.txt

+#------------------------------------------------------------------------------
+# CLING - the C++ LLVM-based InterpreterG :)
+#
+# This file is dual-licensed: you can choose to license it under the University
+# of Illinois Open Source License or the GNU Lesser General Public License. See
+# LICENSE.TXT for details.
+#------------------------------------------------------------------------------
+
 cmake_minimum_required(VERSION 3.5)
 
 set(CMAKE_CXX_STANDARD 11)

interpreter/cling/tools/demo/cling-demo.cpp

+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+// author:  Axel Naumann <axel@cern.ch>
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+//------------------------------------------------------------------------------
+
 #include <cling/Interpreter/Interpreter.h>
 #include <cling/Interpreter/Value.h>
 #include <iostream>