ENH: make it work with cmake 1.6 with no backwards compatibility

CMakeLists.txt

@@ -1,5 +1,15 @@
 PROJECT(CMake)
 
+IF(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 1.4)
+  IF(CMAKE_GENERATOR MATCHES "Visual Studio 7")
+    SET(CMAKE_SKIP_COMPATIBILITY_TESTS 1)
+  ENDIF(CMAKE_GENERATOR MATCHES "Visual Studio 7")
+  IF(CMAKE_GENERATOR MATCHES "Visual Studio 6")
+    SET(CMAKE_SKIP_COMPATIBILITY_TESTS 1)
+  ENDIF(CMAKE_GENERATOR MATCHES "Visual Studio 6")
+  INCLUDE (${CMAKE_ROOT}/Modules/CMakeBackwardCompatibilityCXX.cmake)
+ENDIF(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 1.4)
+
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")