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diff --git a/Source/cmDocumentationFormatter.h b/Source/cmDocumentationFormatter.h
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+++ b/Source/cmDocumentationFormatter.h
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+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef _cmDocumentationFormatter_h
+#define _cmDocumentationFormatter_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <iosfwd>
+
+/** This is just a helper class to make it build with MSVC 6.0.
+Actually the enums and internal classes could directly go into
+cmDocumentation, but then MSVC6 complains in RequestedHelpItem that
+cmDocumentation is an undefined type and so it doesn't know the enums.
+Moving the enums to a class which is then already completely parsed helps
+against this. */
+class cmDocumentationEnums
+{
+public:
+  /** Types of help provided.  */
+  enum Type
+  {
+    None,
+    Version,
+    Usage,
+    Help,
+    Full,
+    ListManuals,
+    ListCommands,
+    ListModules,
+    ListProperties,
+    ListVariables,
+    ListPolicies,
+    ListGenerators,
+    OneManual,
+    OneCommand,
+    OneModule,
+    OneProperty,
+    OneVariable,
+    OnePolicy,
+    OldCustomModules
+  };
+};
+
+class cmDocumentationSection;
+
+/** Print documentation in a simple text format. */
+class cmDocumentationFormatter
+{
+public:
+  cmDocumentationFormatter();
+  virtual ~cmDocumentationFormatter();
+  void PrintFormatted(std::ostream& os, const char* text);
+
+  virtual void PrintSection(std::ostream& os,
+                            cmDocumentationSection const& section);
+  virtual void PrintPreformatted(std::ostream& os, const char* text);
+  virtual void PrintParagraph(std::ostream& os, const char* text);
+  void PrintColumn(std::ostream& os, const char* text);
+  void SetIndent(const char* indent);
+
+private:
+  int TextWidth = 77;
+  const char* TextIndent = "";
+};
+
+#endif