diff --git a/trunk/paradiseo-moeo/tutorial/Lesson1/src/CMakeLists.txt b/trunk/paradiseo-moeo/tutorial/Lesson1/src/CMakeLists.txt
index 9e938a42d..d29b34f5a 100644
--- a/trunk/paradiseo-moeo/tutorial/Lesson1/src/CMakeLists.txt
+++ b/trunk/paradiseo-moeo/tutorial/Lesson1/src/CMakeLists.txt
@@ -103,6 +103,8 @@ ELSEIF(WIN32)
   	TARGET_LINK_LIBRARIES(FlowShopEA flowshop)
     TARGET_LINK_LIBRARIES(FlowShopEA eo)
     TARGET_LINK_LIBRARIES(FlowShopEA eoutils)   
+  ELSE(CMAKE_BUILD_TYPE STREQUAL Debug)
+    MESSAGE(FATAL_ERROR " Cmake build type can only be \"Debug\" or \"Release\" ")
   ENDIF(CMAKE_BUILD_TYPE STREQUAL Debug)
 
 ENDIF(UNIX)
diff --git a/trunk/paradiseo-moeo/tutorial/Lesson1/src/flowshop/CMakeLists.txt b/trunk/paradiseo-moeo/tutorial/Lesson1/src/flowshop/CMakeLists.txt
index 250d5814c..ab2a5e6fb 100644
--- a/trunk/paradiseo-moeo/tutorial/Lesson1/src/flowshop/CMakeLists.txt
+++ b/trunk/paradiseo-moeo/tutorial/Lesson1/src/flowshop/CMakeLists.txt
@@ -102,6 +102,8 @@ ELSEIF(WIN32)
   ELSEIF(CMAKE_BUILD_TYPE STREQUAL Release)
   	TARGET_LINK_LIBRARIES(flowshop moeo)
     TARGET_LINK_LIBRARIES(flowshop eo)
+  ELSE(CMAKE_BUILD_TYPE STREQUAL Debug)
+    MESSAGE(FATAL_ERROR " Cmake build type can only be \"Debug\" or \"Release\" ")
   ENDIF(CMAKE_BUILD_TYPE STREQUAL Debug)
 
 ENDIF(UNIX)
diff --git a/trunk/paradiseo-moeo/tutorial/Lesson2/src/CMakeLists.txt b/trunk/paradiseo-moeo/tutorial/Lesson2/src/CMakeLists.txt
index f1839b823..225fefce6 100644
--- a/trunk/paradiseo-moeo/tutorial/Lesson2/src/CMakeLists.txt
+++ b/trunk/paradiseo-moeo/tutorial/Lesson2/src/CMakeLists.txt
@@ -88,6 +88,8 @@ ELSEIF(WIN32)
   	TARGET_LINK_LIBRARIES(sch1 moeo)
     TARGET_LINK_LIBRARIES(sch1 eo)
     TARGET_LINK_LIBRARIES(sch1 eoutils)   
+  ELSE(CMAKE_BUILD_TYPE STREQUAL Debug)
+    MESSAGE(FATAL_ERROR " Cmake build type can only be \"Debug\" or \"Release\" ")
   ENDIF(CMAKE_BUILD_TYPE STREQUAL Debug)
 
 ENDIF(UNIX)