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diff --git a/src/Fl_System_Driver.H b/src/Fl_System_Driver.H
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+//
+// "$Id$"
+//
+// A base class for platform specific system calls
+// for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2010-2018 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:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
+/** \file Fl_System_Driver.H
+ \brief declaration of class Fl_System_Driver.
+*/
+
+#ifndef FL_SYSTEM_DRIVER_H
+#define FL_SYSTEM_DRIVER_H
+
+#include <FL/Fl.H>
+#include <FL/Fl_Export.H>
+#include <FL/filename.H>
+#include <FL/Fl_Preferences.H>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <time.h>
+
+class Fl_File_Icon;
+class Fl_File_Browser;
+class Fl_Pixmap;
+class Fl_Widget;
+
+/**
+ \brief A base class for platform-specific system operations.
+ This class is only for internal use by the FLTK library.
+ Each supported platform implements several of the virtual methods of this class.
+  */
+class FL_EXPORT Fl_System_Driver {
+  friend class Fl;
+public:
+  struct Keyname {
+    unsigned int key;
+    const char* name;
+  };
+protected:
+  // implement once for each platform
+  static Fl_System_Driver *newSystemDriver();
+  Fl_System_Driver();
+  // key_table and key_table_size are used in fl_shortcut to translate key names
+  Keyname *key_table;
+  int key_table_size;
+public:
+  virtual ~Fl_System_Driver();
+  // These flags are useful after calling XParseGeometry(). They indicate which of its arguments
+  // contain meaningful data upon return.
+  static const int fl_NoValue;
+  static const int fl_WidthValue;
+  static const int fl_HeightValue;
+  static const int fl_XValue;
+  static const int fl_YValue;
+  static const int fl_XNegative;
+  static const int fl_YNegative;
+
+  // implement if the system adds unwanted program argument(s)
+  virtual int single_arg(const char *arg) { return 0; }
+  // implement if the system adds unwanted program argument pair(s)
+  virtual int arg_and_value(const char *name, const char *value) { return 0; }
+  // implement to process the -display argument
+  virtual void display_arg(const char *arg) { }
+  // default implementation should be enough
+  virtual int XParseGeometry(const char* string, int* x, int* y, unsigned int* width, unsigned int* height);
+  static void warning(const char* format, ...);
+  // implement to set the default effect of Fl::warning()
+  virtual void warning(const char* format, va_list args);
+  static void error(const char* format, ...);
+  // implement to set the default effect of Fl::error()
+  virtual void error(const char* format, va_list args);
+  static void fatal(const char* format, ...);
+  // implement to set the default effect of Fl::error()
+  virtual void fatal(const char* format, va_list args);
+
+  // implement these to support cross-platform file operations
+  virtual char *utf2mbcs(const char *s) {return (char*)s;}
+  virtual char *getenv(const char* v) {return NULL;}
+  virtual int putenv(char* v) {return -1;}
+  virtual int open(const char* f, int oflags, int pmode) {return -1;}
+
+  // Note: the default implementation ignores the 'binary' argument.
+  // Some platforms (notably Windows) may use this argument.
+  virtual int open_ext(const char* f, int binary, int oflags, int pmode) {
+    return this->open(f, oflags, pmode);
+  }
+  virtual FILE *fopen(const char* f, const char *mode);
+  virtual int system(const char* cmd) {return -1;}
+  virtual int execvp(const char *file, char *const *argv) {return -1;}
+  virtual int chmod(const char* f, int mode) {return -1;}
+  virtual int access(const char* f, int mode) { return -1;}
+  virtual int stat(const char* f, struct stat *b) { return -1;}
+  virtual char *getcwd(char* b, int l) {return NULL;}
+  virtual int chdir(const char* path) {return -1;}
+  virtual int unlink(const char* fname) {return -1;}
+  virtual int mkdir(const char* f, int mode) {return -1;}
+  virtual int rmdir(const char* f) {return -1;}
+  virtual int rename(const char* f, const char *n) {return -1;}
+
+  // the default implementation of these utf8... functions should be enough
+  virtual unsigned utf8towc(const char* src, unsigned srclen, wchar_t* dst, unsigned dstlen);
+  virtual unsigned utf8fromwc(char* dst, unsigned dstlen, const wchar_t* src, unsigned srclen);
+  virtual int utf8locale() {return 1;}
+  virtual unsigned utf8to_mb(const char* src, unsigned srclen, char* dst, unsigned dstlen);
+  virtual unsigned utf8from_mb(char* dst, unsigned dstlen, const char* src, unsigned srclen);
+  // implement to shield fprintf() from locale changes in decimal point
+  virtual int clocale_printf(FILE *output, const char *format, va_list args);
+  // implement functions telling whether a key is pressed
+  virtual int event_key(int k) {return 0;}
+  virtual int get_key(int k) {return 0;}
+  // implement scandir-like function
+  virtual int filename_list(const char *d, dirent ***list, int (*sort)(struct dirent **, struct dirent **) ) {return -1;}
+  // the default implementation of filename_expand() may be enough
+  virtual int filename_expand(char *to, int tolen, const char *from);
+  // to implement
+  virtual const char *getpwnam(const char *login) {return NULL;}
+  // the default implementation of filename_relative() is in src/filename_absolute.cxx and may be enough
+  virtual int filename_relative(char *to, int tolen, const char *from, const char *base);
+  // the default implementation of filename_absolute() is in src/filename_absolute.cxx and may be enough
+  virtual int filename_absolute(char *to, int tolen, const char *from);
+  // the default implementation of filename_isdir() is in src/filename_isdir.cxx and may be enough
+  virtual int filename_isdir(const char* n);
+  // the default implementation of filename_isdir_quick() is in src/filename_isdir.cxx and may be enough
+  virtual int filename_isdir_quick(const char* n);
+  // the default implementation of filename_ext() is in src/filename_ext.cxx and may be enough
+  virtual const char *filename_ext(const char *buf);
+  // implement to support fl_filename_name()
+  virtual const char *filename_name(const char *buf) {return buf;}
+  // whether a platform uses additional code in Fl_Menu::handle(int e)
+  virtual int need_menu_handle_part2() {return 0;}
+  // whether a platform uses additional code in Fl_Menu::handle_part1(int e)
+  virtual int need_menu_handle_part1_extra() {return 0;}
+  // implement to support fl_open_uri()
+  virtual int open_uri(const char *uri, char *msg, int msglen) {return 0;}
+  // the default implementation of use_tooltip_timeout_condition() may be enough
+  virtual int use_tooltip_timeout_condition() {return 0;}
+  // the default implementation of use_recent_tooltip_fix() may be enough
+  virtual int use_recent_tooltip_fix() {return 0;}
+  // the default implementation of shortcut_add_key_name() is in src/fl_shortcut.cxx
+  virtual const char *shortcut_add_key_name(unsigned key, char *p, char *buf, const char **);
+  // the default implementation of need_test_shortcut_extra() may be enough
+  virtual int need_test_shortcut_extra() {return 0;}
+  // implement to support Fl_File_Browser::load()
+  virtual int file_browser_load_filesystem(Fl_File_Browser *browser, char *filename, int lname, Fl_File_Icon *icon) {return 0;}
+  // the default implementation of file_browser_load_directory() should be enough
+  virtual int file_browser_load_directory(const char *directory, char *filename, size_t name_size, dirent ***pfiles, Fl_File_Sort_F *sort);
+  // implement to support Fl_Preferences
+  virtual void newUUID(char *uuidBuffer) { uuidBuffer[0] = 0; }
+  // implement to support Fl_Preferences
+  virtual char *preference_rootnode(Fl_Preferences *prefs, Fl_Preferences::Root root, const char *vendor,
+                                    const char *application) {return NULL;}
+  // the default implementation of preferences_need_protection_check() may be enough
+  virtual int preferences_need_protection_check() {return 0;}
+  // implement to support Fl_Plugin_Manager::load()
+  virtual void *dlopen(const char *filename) {return NULL;}
+  // the default implementation is most probably enough
+  virtual void png_extra_rgba_processing(unsigned char *array, int w, int h) {}
+  // the default implementation is most probably enough
+  virtual const char *next_dir_sep(const char *start) { return strchr(start, '/');}
+  // implement to support threading
+  virtual void awake(void*) {}
+  virtual int lock() {return 1;}
+  virtual void unlock() {}
+  virtual void* thread_message() {return NULL;}
+  // implement to support Fl_File_Icon
+  virtual int file_type(const char *filename);
+  // implement to return the user's home directory name
+  virtual const char *home_directory_name() { return ""; }
+  // the default implementation is most probably enough
+  virtual const char *filesystems_label() { return "File Systems"; }
+  // return TRUE means \ same as / in file names
+  virtual int backslash_as_slash() {return 0;}
+  // return TRUE means : indicates a drive letter in file names
+  virtual int colon_is_drive() {return 0;}
+  // return TRUE means that files whose name begins with dot are hidden
+  virtual int dot_file_hidden() {return 0;}
+  // return TRUE when file names are case insensitive
+  virtual int case_insensitive_filenames() {return 0;}
+  // the implementations of local_to_latin1() and latin1_to_local() are in fl_encoding_latin1.cxx
+  virtual const char *local_to_latin1(const char *t, int n);
+  virtual const char *latin1_to_local(const char *t, int n);
+  // the implementations of local_to_mac_roman() and mac_roman_to_local() are in fl_encoding_mac_roman.cxx
+  virtual const char *local_to_mac_roman(const char *t, int n);
+  virtual const char *mac_roman_to_local(const char *t, int n);
+  // the default implementation is most probably enough
+  virtual void own_colormap() {}
+  // the default implementations of tree_openpixmap() and tree_closepixmap() are
+  // in Fl_Tree_Prefs.cxx and can be enough
+  virtual Fl_Pixmap *tree_openpixmap();
+  virtual Fl_Pixmap *tree_closepixmap();
+  static const char *const tree_open_xpm[]; // used by tree_openpixmap()
+  static const char * const tree_close_xpm[]; // used by tree_closepixmap()
+  // the default implementation of tree_connector_style() is in Fl_Tree_Prefs.cxx and can be enough
+  virtual int tree_connector_style();
+  // implement to support copy-to-clipboard
+  virtual void copy(const char *stuff, int len, int clipboard, const char *type) {}
+  // implement to support paste-from-clipboard
+  virtual void paste(Fl_Widget &receiver, int clipboard, const char *type) {}
+  // implement to support paste-from-clipboard
+  virtual int clipboard_contains(const char *type) {return 0;}
+  //  implement to support paste-from-clipboard
+  virtual void clipboard_notify_change() {}
+  virtual void add_fd(int fd, int when, Fl_FD_Handler cb, void* = 0);
+  virtual void add_fd(int fd, Fl_FD_Handler cb, void* = 0);
+  virtual void remove_fd(int, int when);
+  virtual void remove_fd(int);
+  // the default implementation of open_callback() may be enough
+  virtual void open_callback(void (*)(const char *));
+  // The default implementation may be enough.
+  virtual void gettime(time_t *sec, int *usec);
+  // The default implementation of the next 4 functions may be enough.
+  virtual const char *shift_name() { return "Shift"; }
+  virtual const char *meta_name() { return "Meta"; }
+  virtual const char *alt_name() { return "Alt"; }
+  virtual const char *control_name() { return "Ctrl"; }
+};
+
+#endif // FL_SYSTEM_DRIVER_H
+
+/**
+ \}
+ \endcond
+ */
+
+//
+// End of "$Id$".
+//