diff --git a/Templates/CMakeSystemConfig.cmake.in b/Templates/CMakeSystemConfig.cmake.in
index b741bbb9e..d849b10ac 100644
--- a/Templates/CMakeSystemConfig.cmake.in
+++ b/Templates/CMakeSystemConfig.cmake.in
@@ -45,6 +45,6 @@ SET (CMAKE_SHLIB_RUNTIME_SEP "@CMAKE_SHLIB_RUNTIME_SEP@" CACHE STRING
 # support for X11
 SET (CMAKE_X_LIBS             "@X_PRE_LIBS@ @X_LIBS@ -lX11 -lXext @X_EXTRA_LIBS@" CACHE STRING "Libraries and options used in X11 programs")
 SET (CMAKE_X_CFLAGS           "@X_CFLAGS@" CACHE STRING "X11 extra flags")
-SET (CMAKE_HAS_X              @CMAKE_HAS_X@ )
-SET (CMAKE_NO_ANSI_STREAM_HEADERS @CMAKE_NO_ANSI_STREAM_HEADERS@ )
-SET (CMAKE_NO_STD_NAMESPACE       @CMAKE_NO_STD_NAMESPACE@  )
+SET (CMAKE_HAS_X              @CMAKE_HAS_X@ CACHE INTERNAL "Is X11 around")
+SET (CMAKE_NO_ANSI_STREAM_HEADERS @CMAKE_NO_ANSI_STREAM_HEADERS@ CACHE INTERNAL "does the compiler support headers like iostream ")
+SET (CMAKE_NO_STD_NAMESPACE       @CMAKE_NO_STD_NAMESPACE@  CACHE INTERNAL "does the compiler support std:: ")