help with hash_map/gcc?

Hello,
I'm trying to compile the ctemplate package from google and I've run
into an issue with gcc

g++ version: gcc version 4.2.3 Ubuntu 4.2.3-2ubuntu7)

The problem:

google/template_modifiers.h:289: error: 'hash_compare' was not
declared in this scope
google/template_modifiers.h:289: error: template argument 3 is invalid

The line in error is this one:

  typedef __gnu_cxx::hash_map<const char*, const void*,
hash_compare<const char*>, DataEq>
    DataMap;

hash_compare isn't declared in either of these
#include <ext/hash_set>
#include <ext/hash_map>

here's a code excerpt:

#ifdef WIN32
  struct DataHash {
    size_t operator()(const char* s1) const {
      return stdext::hash_compare<const char*>()(s1);
    }
    bool operator()(const char* s1, const char* s2) const { // less-
than
      return (s2 == 0 ? false : s1 == 0 ? true : strcmp(s1, s2) < 0);
    }
    // These two public members are required by msvc. 4 and 8 are
defaults.
    static const size_t bucket_size = 4;
    static const size_t min_buckets = 8;
  };

  typedef stdext::hash_map<const char*, const void*, DataHash>
DataMap;
#else
  struct DataEq {
    bool operator()(const char* s1, const char* s2) const {
      return ((s1 == 0 && s2 == 0) ||
              (s1 && s2 && *s1 == *s2 && strcmp(s1, s2) == 0));
    }
  };
  typedef __gnu_cxx::hash_map<const char*, const void*,
hash_compare<const char*>, DataEq>
    DataMap;
#endif

hash_compare is part of the hash code that the author's compiler has
and that I evidently don't.
Is this code somewhere I didn't look?
Can I get that code somewhere?

Thanks for your help!

Jay (please direct too so I don't miss your message)

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