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diff --git a/fluid/app/args.h b/fluid/app/args.h
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+++ b/fluid/app/args.h
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+//
+// Command Line Arguments Handling header for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2025 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_APP_ARGS_H
+#define FLUID_APP_ARGS_H
+
+#include <string>
+
+namespace fld {
+namespace app {
+
+class Args {
+  // Callback.
+  static int arg_cb(int argc, char** argv, int& i);
+  // Handle args individually.
+  int arg(int argc, char** argv, int& i);
+public:
+  /// Set, if Fluid was started with the command line argument -u
+  int update_file { 0 };            // fluid -u
+  /// Set, if Fluid was started with the command line argument -c
+  int compile_file { 0 };           // fluid -c
+  /// Set, if Fluid was started with the command line argument -cs
+  int compile_strings { 0 };        // fluid -cs
+  /// command line arguments that overrides the generate code file extension or name
+  std::string code_filename { };    // fluid -o filename
+  /// command line arguments that overrides the generate header file extension or name
+  std::string header_filename { };  // fluid -h filename
+  /// if set, generate images for automatic documentation in this directory
+  std::string autodoc_path { };         // fluid --autodoc path
+  /// Set, if Fluid was started with the command line argument -v
+  int show_version { 0 };           // fluid -v
+  /// Constructor.
+  Args() = default;
+  // Load args from command line into variables.
+  int load(int argc, char **argv);
+};
+
+} // namespace app
+} // namespace fld
+
+#endif // FLUID_APP_ARGS_H
+