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diff --git a/Source/kwsys/hash_fun.hxx.in b/Source/kwsys/hash_fun.hxx.in
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+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+/*
+ * Copyright (c) 1996
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ */
+#ifndef @KWSYS_NAMESPACE@_hash_fun_hxx
+#define @KWSYS_NAMESPACE@_hash_fun_hxx
+
+#include <@KWSYS_NAMESPACE@/Configure.hxx>
+
+#include <stddef.h> // size_t
+#include <string>
+
+namespace @KWSYS_NAMESPACE@ {
+
+template <class _Key>
+struct hash
+{
+};
+
+inline size_t _stl_hash_string(const char* __s)
+{
+  unsigned long __h = 0;
+  for (; *__s; ++__s)
+    __h = 5 * __h + *__s;
+
+  return size_t(__h);
+}
+
+template <>
+struct hash<char*>
+{
+  size_t operator()(const char* __s) const { return _stl_hash_string(__s); }
+};
+
+template <>
+struct hash<const char*>
+{
+  size_t operator()(const char* __s) const { return _stl_hash_string(__s); }
+};
+
+template <>
+struct hash<std::string>
+{
+  size_t operator()(const std::string& __s) const
+  {
+    return _stl_hash_string(__s.c_str());
+  }
+};
+
+#if !defined(__BORLANDC__)
+template <>
+struct hash<const std::string>
+{
+  size_t operator()(const std::string& __s) const
+  {
+    return _stl_hash_string(__s.c_str());
+  }
+};
+#endif
+
+template <>
+struct hash<char>
+{
+  size_t operator()(char __x) const { return __x; }
+};
+
+template <>
+struct hash<unsigned char>
+{
+  size_t operator()(unsigned char __x) const { return __x; }
+};
+
+template <>
+struct hash<signed char>
+{
+  size_t operator()(unsigned char __x) const { return __x; }
+};
+
+template <>
+struct hash<short>
+{
+  size_t operator()(short __x) const { return __x; }
+};
+
+template <>
+struct hash<unsigned short>
+{
+  size_t operator()(unsigned short __x) const { return __x; }
+};
+
+template <>
+struct hash<int>
+{
+  size_t operator()(int __x) const { return __x; }
+};
+
+template <>
+struct hash<unsigned int>
+{
+  size_t operator()(unsigned int __x) const { return __x; }
+};
+
+template <>
+struct hash<long>
+{
+  size_t operator()(long __x) const { return __x; }
+};
+
+template <>
+struct hash<unsigned long>
+{
+  size_t operator()(unsigned long __x) const { return __x; }
+};
+
+// use long long or __int64
+#if @KWSYS_USE_LONG_LONG@
+template <>
+struct hash<long long>
+{
+  size_t operator()(long long __x) const { return __x; }
+};
+
+template <>
+struct hash<unsigned long long>
+{
+  size_t operator()(unsigned long long __x) const { return __x; }
+};
+#elif @KWSYS_USE___INT64@
+template <>
+struct hash<__int64>
+{
+  size_t operator()(__int64 __x) const { return __x; }
+};
+template <>
+struct hash<unsigned __int64>
+{
+  size_t operator()(unsigned __int64 __x) const { return __x; }
+};
+#endif // use long long or __int64
+
+} // namespace @KWSYS_NAMESPACE@
+
+#endif