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diff --git a/Source/cmExternalMakefileProjectGenerator.h b/Source/cmExternalMakefileProjectGenerator.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 cmExternalMakefileProjectGenerator_h
+#define cmExternalMakefileProjectGenerator_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <string>
+#include <vector>
+
+class cmGlobalGenerator;
+class cmMakefile;
+
+/** \class cmExternalMakefileProjectGenerator
+ * \brief Base class for generators for "External Makefile based IDE projects".
+ *
+ * cmExternalMakefileProjectGenerator is a base class for generators
+ * for "external makefile based projects", i.e. IDE projects which work
+ * an already existing makefiles.
+ * See cmGlobalKdevelopGenerator as an example.
+ * After the makefiles have been generated by one of the Makefile
+ * generators, the Generate() method is called and this generator
+ * can iterate over the local generators and/or projects to produce the
+ * project files for the IDE.
+ */
+class cmExternalMakefileProjectGenerator
+{
+public:
+  virtual ~cmExternalMakefileProjectGenerator() {}
+
+  virtual void EnableLanguage(std::vector<std::string> const& languages,
+                              cmMakefile*, bool optional);
+
+  ///! set the global generator which will generate the makefiles
+  virtual void SetGlobalGenerator(cmGlobalGenerator* generator)
+  {
+    this->GlobalGenerator = generator;
+  }
+
+  ///! Return the list of global generators supported by this extra generator
+  const std::vector<std::string>& GetSupportedGlobalGenerators() const
+  {
+    return this->SupportedGlobalGenerators;
+  }
+
+  /** Create a full name from the given global generator name and the
+   * extra generator name
+   */
+  static std::string CreateFullGeneratorName(
+    const std::string& globalGenerator, const std::string& extraGenerator);
+
+  ///! Generate the project files, the Makefiles have already been generated
+  virtual void Generate() = 0;
+
+  void SetName(const std::string& n) { Name = n; }
+  std::string GetName() const { return Name; }
+
+  virtual bool Open(const std::string& bindir, const std::string& projectName,
+                    bool dryRun);
+
+protected:
+  ///! Contains the names of the global generators support by this generator.
+  std::vector<std::string> SupportedGlobalGenerators;
+  ///! the global generator which creates the makefiles
+  const cmGlobalGenerator* GlobalGenerator;
+
+  std::string Name;
+};
+
+class cmExternalMakefileProjectGeneratorFactory
+{
+public:
+  cmExternalMakefileProjectGeneratorFactory(const std::string& n,
+                                            const std::string& doc);
+  virtual ~cmExternalMakefileProjectGeneratorFactory();
+
+  std::string GetName() const;
+  std::string GetDocumentation() const;
+  std::vector<std::string> GetSupportedGlobalGenerators() const;
+  std::vector<std::string> Aliases;
+
+  virtual cmExternalMakefileProjectGenerator*
+  CreateExternalMakefileProjectGenerator() const = 0;
+
+  void AddSupportedGlobalGenerator(const std::string& base);
+
+private:
+  std::string Name;
+  std::string Documentation;
+  std::vector<std::string> SupportedGlobalGenerators;
+};
+
+template <class T>
+class cmExternalMakefileProjectGeneratorSimpleFactory
+  : public cmExternalMakefileProjectGeneratorFactory
+{
+public:
+  cmExternalMakefileProjectGeneratorSimpleFactory(const std::string& n,
+                                                  const std::string& doc)
+    : cmExternalMakefileProjectGeneratorFactory(n, doc)
+  {
+  }
+
+  cmExternalMakefileProjectGenerator* CreateExternalMakefileProjectGenerator()
+    const override
+  {
+    T* p = new T;
+    p->SetName(GetName());
+    return p;
+  }
+};
+
+#endif