message: Un-regress several compilers.
diff: #define GOOGLE_NAMESPACE ::google
  /* the location of the header defining hash functions */
  -// #define HASH_FUN_H <tr1/functional>
  +#if defined( __APPLE__ ) && defined( __clang__ )
  #define HASH_FUN_H <functional>
  +#else
  + #define HASH_FUN_H <tr1/functional>
  +#endif
  /* the namespace of the hash<> function */
  -// #define HASH_NAMESPACE std::tr1
  +#if defined( __APPLE__ ) && defined( __clang__ )
  #define HASH_NAMESPACE std
  +#else
  + #define HASH_NAMESPACE std::tr1
  +#endif
  /* Define to 1 if you have the <inttypes.h> header file. */
  #define HAVE_INTTYPES_H 1
  