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diff --git a/fluid/mergeback.h b/fluid/mergeback.h
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+++ b/fluid/mergeback.h
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+//
+// MergeBack routines for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2023 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#ifndef _FLUID_MERGEBACK_H
+#define _FLUID_MERGEBACK_H
+
+#include <FL/fl_attr.h>
+
+#include "../src/Fl_String.H"
+
+#include <stdio.h>
+
+const int FD_TAG_GENERIC = 0;
+const int FD_TAG_CODE = 1;
+const int FD_TAG_MENU_CALLBACK = 2;
+const int FD_TAG_WIDGET_CALLBACK = 3;
+const int FD_TAG_LAST = 3;
+
+const int FD_MERGEBACK_ANALYSE = 0;
+const int FD_MERGEBACK_INTERACTIVE = 1;
+const int FD_MERGEBACK_APPLY = 2;
+const int FD_MERGEBACK_APPLY_IF_SAFE = 3;
+
+/** Class that implements the MergeBack functionality.
+ \see merge_back(const Fl_String &s, int task)
+ */
+class Fd_Mergeback
+{
+protected:
+  /// Pointer to the C++ code file.
+  FILE *code;
+  /// Current line number in the C++ code file.
+  int line_no;
+  /// Set if there was an error reading a tag.
+  int tag_error;
+  /// Number of code blocks that were different than the CRC in their tag.
+  int num_changed_code;
+  /// Number of generic structure blocks that were different than the CRC in their tag.
+  int num_changed_structure;
+  /// Number of code block that were modified, but a type node by that uid was not found.
+  int num_uid_not_found;
+  /// Number of modified code block where the corresponding project block also changed.
+  int num_possible_override;
+
+  void unindent(char *s);
+  Fl_String read_and_unindent_block(long start, long end);
+  void analyse_callback(unsigned long code_crc, unsigned long tag_crc, int uid);
+  void analyse_code(unsigned long code_crc, unsigned long tag_crc, int uid);
+  int apply_callback(long block_end, long block_start, unsigned long code_crc, int uid);
+  int apply_code(long block_end, long block_start, unsigned long code_crc, int uid);
+
+public:
+  Fd_Mergeback();
+  ~Fd_Mergeback();
+  int merge_back(const Fl_String &s, int task);
+  int ask_user_to_merge();
+  int analyse();
+  int apply();
+};
+
+extern int merge_back(const Fl_String &s, int task);
+
+
+#endif // _FLUID_MERGEBACK_H