diff --git a/FL/Fl_Window.H b/FL/Fl_Window.H
index 58165bffe..317c66247 100644
--- a/FL/Fl_Window.H
+++ b/FL/Fl_Window.H
@@ -22,6 +22,7 @@
 #ifndef Fl_Window_H
 #define Fl_Window_H
 
+#include <FL/Fl.H>
 #include <FL/Fl_Group.H>
 #include <FL/Fl_Bitmap.H>
 #include <stdlib.h>
@@ -54,6 +55,7 @@ class Fl_Double_Window;
 class FL_EXPORT Fl_Window : public Fl_Group {
 
   static char *default_xclass_;
+  static char show_iconic_; // 1 means create next window in iconic form
 
   int no_fullscreen_x;
   int no_fullscreen_y;
@@ -64,6 +66,7 @@ class FL_EXPORT Fl_Window : public Fl_Group {
   int fullscreen_screen_left;
   int fullscreen_screen_right;
 
+  friend int Fl::arg(int argc, char **argv, int &i);
   friend class Fl_X;
   friend class Fl_Window_Driver;
   Fl_X *i; // points at the system-specific stuff, but exists only after the window is mapped
diff --git a/FL/Fl_Window_Driver.H b/FL/Fl_Window_Driver.H
index cc515e382..4779f4354 100644
--- a/FL/Fl_Window_Driver.H
+++ b/FL/Fl_Window_Driver.H
@@ -95,6 +95,7 @@ public:
   virtual void fullscreen_off(int X, int Y, int W, int H) {}
   virtual void use_border();
   virtual void size_range();
+  virtual void iconize() {}
 
   // --- window shape stuff
   void shape_pixmap_(Fl_Image* pixmap); // TODO: check
diff --git a/FL/mac.H b/FL/mac.H
index 0128d1157..da8cf24de 100644
--- a/FL/mac.H
+++ b/FL/mac.H
@@ -177,7 +177,6 @@ public:
   static void GLcontext_makecurrent(NSOpenGLContext*);
   static void GL_cleardrawable(void);
   void destroy(void);
-  void collapse(void);
   WindowRef window_ref(void); // useless with cocoa GL windows
   void set_key_window(void);
   // OS X doesn't have per window icons
diff --git a/src/Fl_Window.cxx b/src/Fl_Window.cxx
index 70701bab6..8ab9aaae9 100644
--- a/src/Fl_Window.cxx
+++ b/src/Fl_Window.cxx
@@ -33,6 +33,8 @@
 
 char *Fl_Window::default_xclass_ = 0L;
 
+char Fl_Window::show_iconic_ = 0;
+
 Fl_Window *Fl_Window::current_;
 
 void Fl_Window::_Fl_Window() {
diff --git a/src/Fl_Window_iconize.cxx b/src/Fl_Window_iconize.cxx
index 93b4fd127..7077d8e0f 100644
--- a/src/Fl_Window_iconize.cxx
+++ b/src/Fl_Window_iconize.cxx
@@ -16,25 +16,15 @@
 //     http://www.fltk.org/str.php
 //
 
-#include <FL/x.H>
+#include <FL/Fl_Window.H>
 #include <FL/Fl_Window_Driver.H>
 
-extern char fl_show_iconic; // in Fl_x.cxx
-
 void Fl_Window::iconize() {
   if (!shown()) {
-    fl_show_iconic = 1;
+    show_iconic_ = 1;
     show();
   } else {
-#ifdef WIN32
-    ShowWindow(i->xid, SW_SHOWMINNOACTIVE);
-#elif defined(__APPLE__) // PORTME: Fl_Window_Driver - platform window driver
-    i->collapse();
-#elif defined(FL_PORTING)
-#  pragma message "FL_PORTING: add code to iconify a window"
-#else
-    XIconifyWindow(fl_display, i->xid, fl_screen);
-#endif
+    pWindowDriver->iconize();
   }
 }
 
diff --git a/src/Fl_arg.cxx b/src/Fl_arg.cxx
index 02f3da1da..34ba95bb1 100644
--- a/src/Fl_arg.cxx
+++ b/src/Fl_arg.cxx
@@ -53,7 +53,6 @@ static int fl_match(const char *a, const char *s, int atleast = 1) {
 }
 
 // flags set by previously parsed arguments:
-extern char fl_show_iconic; // in Fl_x.cxx
 static char arg_called;
 static char return_i;
 static const char *name;
@@ -148,7 +147,7 @@ int Fl::arg(int argc, char **argv, int &i) {
   s++; // point after the dash
 
   if (fl_match(s, "iconic")) {
-    fl_show_iconic = 1;
+    Fl_Window::show_iconic_ = 1;
     i++;
     return 1;
   } else if (fl_match(s, "kbd")) {
diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 5a29767ac..ced8928e1 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -91,8 +91,6 @@ int fl_mac_os_version = Fl_X::calc_mac_os_version();		// the version number of t
 
 // public variables
 void *fl_capture = 0;			// (NSWindow*) we need this to compensate for a missing(?) mouse capture
-bool fl_show_iconic;                    // true if called from iconize() - shows the next created window in collapsed state
-//int fl_disable_transient_for;           // secret method of removing TRANSIENT_FOR
 Window fl_window;
 
 // forward declarations of variables in this file
@@ -2882,11 +2880,11 @@ void Fl_X::make(Fl_Window* w)
     NSUInteger winstyle;
     if (w->parent()) {
       w->border(0);
-      fl_show_iconic = 0;
+      Fl_Window::show_iconic_ = 0;
     }
     if (w->border()) winstyle = NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask;
     else winstyle = NSBorderlessWindowMask;
-    if (fl_show_iconic && !w->parent()) { // prevent window from being out of work area when created iconized
+    if (Fl_Window::show_iconic_ && !w->parent()) { // prevent window from being out of work area when created iconized
       int sx, sy, sw, sh;
       Fl::screen_work_area (sx, sy, sw, sh, w->x(), w->y());
       if (w->x() < sx) w->x(sx);
@@ -3047,8 +3045,8 @@ void Fl_X::make(Fl_Window* w)
     w->set_visible();
     if ( w->border() || (!w->modal() && !w->tooltip_window()) ) Fl::handle(FL_FOCUS, w);
     [cw setDelegate:[FLWindowDelegate singleInstance]];
-  if (fl_show_iconic) {
-    fl_show_iconic = 0;
+  if (Fl_Window::show_iconic_) {
+    Fl_Window::show_iconic_ = 0;
     w->handle(FL_SHOW); // create subwindows if any
     [cw recursivelySendToSubwindows:@selector(display)];  // draw the window and its subwindows before its icon is computed
     [cw miniaturize:nil];
@@ -3560,8 +3558,8 @@ Fl_Region Fl_X::intersect_region_and_rect(Fl_Region current, int x,int y,int w,
   return outr;
 }
 
-void Fl_X::collapse() {
-  [xid miniaturize:nil];
+void Fl_Cocoa_Window_Driver::iconize() {
+  [fl_xid(pWindow) miniaturize:nil];
 }
 
 static NSImage *CGBitmapContextToNSImage(CGContextRef c)
diff --git a/src/Fl_win32.cxx b/src/Fl_win32.cxx
index ef83d833e..72d191617 100644
--- a/src/Fl_win32.cxx
+++ b/src/Fl_win32.cxx
@@ -1643,7 +1643,6 @@ private:
 
 void fl_fix_focus(); // in Fl.cxx
 
-char fl_show_iconic;	// hack for Fl_Window::iconic()
 // int fl_background_pixel = -1; // color to use for background
 UINT fl_wake_msg = 0;
 int fl_disable_transient_for; // secret method of removing TRANSIENT_FOR
@@ -1846,7 +1845,7 @@ Fl_X* Fl_X::make(Fl_Window* w) {
     fl_clipboard_notify_target(x->xid);
 
   x->wait_for_expose = 1;
-  if (fl_show_iconic) {showit = 0; fl_show_iconic = 0;}
+  if (Fl_Window::show_iconic_) {showit = 0; Fl_Window::show_iconic_ = 0;}
   if (showit) {
     w->set_visible();
     int old_event = Fl::e_number;
diff --git a/src/Fl_x.cxx b/src/Fl_x.cxx
index 9e73011a9..d73a22dba 100644
--- a/src/Fl_x.cxx
+++ b/src/Fl_x.cxx
@@ -2313,7 +2313,6 @@ Fl_X* Fl_X::set_xid(Fl_Window* win, Window winxid) {
 // normally.  The global variables like fl_show_iconic are so that
 // subclasses of *that* class may change the behavior...
 
-char fl_show_iconic;    // hack for iconize()
 int fl_background_pixel = -1; // hack to speed up bg box drawing
 int fl_disable_transient_for; // secret method of removing TRANSIENT_FOR
 
@@ -2527,10 +2526,10 @@ void Fl_X::make_xid(Fl_Window* win, XVisualInfo *visual, Colormap colormap)
     XWMHints *hints = XAllocWMHints();
     hints->input = True;
     hints->flags = InputHint;
-    if (fl_show_iconic) {
+    if (Fl_Window::show_iconic_) {
       hints->flags |= StateHint;
       hints->initial_state = IconicState;
-      fl_show_iconic = 0;
+      Fl_Window::show_iconic_ = 0;
       showit = 0;
     }
     if (((Fl_X11_Window_Driver*)win->pWindowDriver)->icon_->legacy_icon) {
diff --git a/src/drivers/Cocoa/Fl_Cocoa_Window_Driver.H b/src/drivers/Cocoa/Fl_Cocoa_Window_Driver.H
index f3d8a85be..8cce010f6 100644
--- a/src/drivers/Cocoa/Fl_Cocoa_Window_Driver.H
+++ b/src/drivers/Cocoa/Fl_Cocoa_Window_Driver.H
@@ -83,6 +83,7 @@ public:
   virtual void fullscreen_on();
   virtual void fullscreen_off(int X, int Y, int W, int H);
   virtual void size_range();
+  virtual void iconize();
 
   virtual void shape(const Fl_Image* img);
   // that one is implemented in Fl_Cocoa.mm because it uses Objective-c
diff --git a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.H b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.H
index b1218ab6c..2cae854ef 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.H
+++ b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.H
@@ -87,6 +87,7 @@ public:
   virtual void unmap();
   virtual void fullscreen_on();
   virtual void fullscreen_off(int X, int Y, int W, int H);
+  virtual void iconize();
 
   virtual void shape(const Fl_Image* img);
   virtual void icons(const Fl_RGB_Image *icons[], int count);
diff --git a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
index 4eadbddfd..dd3b64168 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
@@ -608,6 +608,11 @@ void Fl_WinAPI_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
   Fl::handle(FL_FULLSCREEN, pWindow);
 }
 
+
+void Fl_WinAPI_Window_Driver::iconize() {
+  ShowWindow(fl_xid(pWindow), SW_SHOWMINNOACTIVE);
+}
+
 //
 // End of "$Id$".
 //
diff --git a/src/drivers/X11/Fl_X11_Window_Driver.H b/src/drivers/X11/Fl_X11_Window_Driver.H
index 47272a834..35cee4afd 100644
--- a/src/drivers/X11/Fl_X11_Window_Driver.H
+++ b/src/drivers/X11/Fl_X11_Window_Driver.H
@@ -98,6 +98,7 @@ public:
   virtual void fullscreen_off(int X, int Y, int W, int H);
   virtual void use_border();
   virtual void size_range();
+  virtual void iconize();
 
   virtual void shape(const Fl_Image* img);
   virtual void icons(const Fl_RGB_Image *icons[], int count);
diff --git a/src/drivers/X11/Fl_X11_Window_Driver.cxx b/src/drivers/X11/Fl_X11_Window_Driver.cxx
index 2daf3f347..2d6782eaf 100644
--- a/src/drivers/X11/Fl_X11_Window_Driver.cxx
+++ b/src/drivers/X11/Fl_X11_Window_Driver.cxx
@@ -504,6 +504,10 @@ void Fl_X11_Window_Driver::size_range() {
   if (pWindow->shown()) Fl_X::i(pWindow)->sendxjunk();
 }
 
+void Fl_X11_Window_Driver::iconize() {
+  XIconifyWindow(fl_display, fl_xid(pWindow), fl_screen);
+}
+
 //
 // End of "$Id$".
 //