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diff --git a/Source/cmFindCommon.h b/Source/cmFindCommon.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 cmFindCommon_h
+#define cmFindCommon_h
+
+#include <cmConfigure.h>
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "cmCommand.h"
+#include "cmPathLabel.h"
+#include "cmSearchPath.h"
+
+class cmMakefile;
+
+/** \class cmFindCommon
+ * \brief Base class for FIND_XXX implementations.
+ *
+ * cmFindCommon is a parent class for cmFindBase,
+ * cmFindProgramCommand, cmFindPathCommand, cmFindLibraryCommand,
+ * cmFindFileCommand, and cmFindPackageCommand.
+ */
+class cmFindCommon : public cmCommand
+{
+public:
+  cmFindCommon();
+  ~cmFindCommon() CM_OVERRIDE;
+
+protected:
+  friend class cmSearchPath;
+
+  /** Used to define groups of path labels */
+  class PathGroup : public cmPathLabel
+  {
+  protected:
+    PathGroup();
+
+  public:
+    PathGroup(const std::string& label)
+      : cmPathLabel(label)
+    {
+    }
+    static PathGroup All;
+  };
+
+  /* Individual path types */
+  class PathLabel : public cmPathLabel
+  {
+  protected:
+    PathLabel();
+
+  public:
+    PathLabel(const std::string& label)
+      : cmPathLabel(label)
+    {
+    }
+    static PathLabel CMake;
+    static PathLabel CMakeEnvironment;
+    static PathLabel Hints;
+    static PathLabel SystemEnvironment;
+    static PathLabel CMakeSystem;
+    static PathLabel Guess;
+  };
+
+  enum RootPathMode
+  {
+    RootPathModeNever,
+    RootPathModeOnly,
+    RootPathModeBoth
+  };
+
+  /** Construct the various path groups and labels */
+  void InitializeSearchPathGroups();
+
+  /** Place a set of search paths under the search roots.  */
+  void RerootPaths(std::vector<std::string>& paths);
+
+  /** Get ignored paths from CMAKE_[SYSTEM_]IGNORE_path variables.  */
+  void GetIgnoredPaths(std::vector<std::string>& ignore);
+  void GetIgnoredPaths(std::set<std::string>& ignore);
+
+  /** Remove paths in the ignore set from the supplied vector.  */
+  void FilterPaths(const std::vector<std::string>& inPaths,
+                   const std::set<std::string>& ignore,
+                   std::vector<std::string>& outPaths);
+
+  /** Compute final search path list (reroot + trailing slash).  */
+  void ComputeFinalPaths();
+
+  /** Compute the current default root path mode.  */
+  void SelectDefaultRootPathMode();
+
+  /** Compute the current default bundle/framework search policy.  */
+  void SelectDefaultMacMode();
+
+  // Path arguments prior to path manipulation routines
+  std::vector<std::string> UserHintsArgs;
+  std::vector<std::string> UserGuessArgs;
+
+  std::string CMakePathName;
+  RootPathMode FindRootPathMode;
+
+  bool CheckCommonArgument(std::string const& arg);
+  void AddPathSuffix(std::string const& arg);
+  void SetMakefile(cmMakefile* makefile);
+
+  bool NoDefaultPath;
+  bool NoCMakePath;
+  bool NoCMakeEnvironmentPath;
+  bool NoSystemEnvironmentPath;
+  bool NoCMakeSystemPath;
+
+  std::vector<std::string> SearchPathSuffixes;
+
+  std::map<PathGroup, std::vector<PathLabel> > PathGroupLabelMap;
+  std::vector<PathGroup> PathGroupOrder;
+  std::map<std::string, PathLabel> PathLabelStringMap;
+  std::map<PathLabel, cmSearchPath> LabeledPaths;
+
+  std::vector<std::string> SearchPaths;
+  std::set<std::string> SearchPathsEmitted;
+
+  bool SearchFrameworkFirst;
+  bool SearchFrameworkOnly;
+  bool SearchFrameworkLast;
+
+  bool SearchAppBundleFirst;
+  bool SearchAppBundleOnly;
+  bool SearchAppBundleLast;
+};
+
+#endif