hack to try and fix sun platform

Modules/Platform/SunOS.cmake

@@ -42,7 +42,9 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
     # Take default rule from CMakeDefaultMakeRuleVariables.cmake.
   ENDIF(CMAKE_COMPILER_IS_GNUCC)
 ELSE(CMAKE_COMPILER_IS_GNUCXX)
-  SET(CMAKE_CXX_CREATE_STATIC_LIBRARY
+  IF(CMAKE_CXX_COMPILER)
+     SET(CMAKE_CXX_CREATE_STATIC_LIBRARY
       "<CMAKE_CXX_COMPILER> -xar -o <TARGET> <OBJECTS> "
       "<CMAKE_RANLIB> <TARGET> ")
+  ENDIF(CMAKE_CXX_COMPILER)
 ENDIF(CMAKE_COMPILER_IS_GNUCXX)