diff --git a/eo/tutorial/Lesson1/FirstBitGA.cpp b/eo/tutorial/Lesson1/FirstBitGA.cpp
index 4e7ea1ab1..f12344b71 100644
--- a/eo/tutorial/Lesson1/FirstBitGA.cpp
+++ b/eo/tutorial/Lesson1/FirstBitGA.cpp
@@ -5,10 +5,19 @@
 // An instance of a VERY simple Bitstring Genetic Algorithm
 //
 //-----------------------------------------------------------------------------
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 // standard includes
 #include <stdexcept>  // runtime_error 
 #include <iostream>   // cout
+#ifdef HAVE_SSTREAM
+#include <sstream>
+#else
 #include <strstream>  // ostrstream, istrstream
+#endif
 
 // the general include for eo
 
diff --git a/eo/tutorial/Lesson1/FirstRealGA.cpp b/eo/tutorial/Lesson1/FirstRealGA.cpp
index 76556882d..392aff4aa 100644
--- a/eo/tutorial/Lesson1/FirstRealGA.cpp
+++ b/eo/tutorial/Lesson1/FirstRealGA.cpp
@@ -5,10 +5,18 @@
 // An instance of a VERY simple Real-coded Genetic Algorithm
 //
 //-----------------------------------------------------------------------------
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 // standard includes
 #include <stdexcept>  // runtime_error 
 #include <iostream>   // cout
+#ifdef HAVE_SSTREAM
+#include <sstream>
+#else
 #include <strstream>  // ostrstream, istrstream
+#endif
 
 // the general include for eo