BUG: Need to invert test result for ansi string stream.

Source/kwsys/CMakeLists.txt

@@ -10,6 +10,10 @@ INCLUDE(${CMAKE_ROOT}/Modules/TestForSTDNamespace.cmake)
 INCLUDE(${CMAKE_ROOT}/Modules/TestForANSIForScope.cmake)
 CHECK_INCLUDE_FILE_CXX("sstream" CMAKE_HAS_ANSI_STRING_STREAM)
 
+IF(NOT CMAKE_HAS_ANSI_STRING_STREAM)
+  SET(CMAKE_NO_ANSI_STRING_STREAM 1)
+ENDIF(NOT CMAKE_HAS_ANSI_STRING_STREAM)
+
 SET(KWSYS_NO_STD_NAMESPACE ${CMAKE_NO_STD_NAMESPACE})
 SET(KWSYS_NO_ANSI_STREAM_HEADERS ${CMAKE_NO_ANSI_STREAM_HEADERS})
 SET(KWSYS_NO_ANSI_STRING_STREAM ${CMAKE_NO_ANSI_STRING_STREAM})