diff --git a/ChangeLog b/ChangeLog
index 0600319..5a31258 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@ ChangeLog
 
     * source code cleaned up
     * added Qt 4 GUI
+    * added FLTK GUI
 
 v0.20
     * various documentation and typo fixes
diff --git a/guifltk.cpp b/guifltk.cpp
index 6edf05a..12ed29b 100644
--- a/guifltk.cpp
+++ b/guifltk.cpp
@@ -18,6 +18,11 @@
  *
  */
 
+#include <FL/Fl.H>
+#include <FL/Fl_Double_Window.H>
+#include <FL/Fl_Spinner.H>
+#include <FL/Fl_Button.H>
+
 extern "C" {
 #include "main.h"
 #include "osdep.h"
@@ -28,6 +33,19 @@ extern "C" {
 #include <X11/extensions/XTest.h>
 
 static Display *display;
+static Fl_Double_Window *w;
+static Fl_Button *buttons[3];
+static Fl_Spinner *spins[4];
+static int repeated = 0;
+
+static const struct foo {
+    const char * const label;
+    const int min, max, val;
+} bar[4] = {
+    { "Pre-delay",   1, 1<<30, 2000 }, { "Interval",    1, 1<<30, 1000 },
+    { "Random +/-",  1, 10240,   64 }, { "# of clicks", 1, 10240,   32 }
+};
+static const char * const butnames[3] = { "Tap", "Stop", "Start" };
 
 void click_mouse_button(void) {
     XTestFakeButtonEvent(display, 1, True, CurrentTime);
@@ -35,19 +53,43 @@ void click_mouse_button(void) {
     XFlush(display);
 }
 
+static void alarm_callback(void *v) {
+    common_alarm_callback();
+}
+
 void set_alarm(int ms) {
+    if (!repeated) {
+        Fl::add_timeout(0.001*ms, alarm_callback);
+        repeated = 1;
+    } else {
+        Fl::repeat_timeout(0.001*ms, alarm_callback);
+    }
 }
 
 int get_spin_value(spin_t spin) {
-//    return mywidget->spins[spin]->value();
+    return spins[spin]->value();
 }
 
 void set_spin_value(spin_t spin, int value) {
-//    mywidget->spins[spin]->setValue(value);
+    spins[spin]->value(value);
 }
 
 void set_button_sensitive(button_t button, int state) {
-//    mywidget->buttons[button]->setEnabled(state);
+    if (state) buttons[button]->activate();
+    else       buttons[button]->deactivate();
+}
+
+static void tap_callback(Fl_Widget *w, void *v) {
+    common_tap_button();
+}
+
+static void stop_callback(Fl_Widget *w, void *v) {
+    repeated = 0;
+    common_stop_button();
+}
+
+static void start_callback(Fl_Widget *w, void *v) {
+    common_start_button();
 }
 
 int init_gui(int argc, char **argv) {
@@ -56,6 +98,22 @@ int init_gui(int argc, char **argv) {
         return 0;
     }
 
+    w = new Fl_Double_Window(175, 155, "fltkAutoClick");
+    w->begin();
+    w->align(FL_ALIGN_CLIP|FL_ALIGN_INSIDE);
+    for (int c=0; c<3; c++)
+        buttons[c] = new Fl_Button(5+55*c, 125, 55, 25, butnames[c]);
+    for (int c=0; c<4; c++) {
+        spins[c] = new Fl_Spinner(95, 5+c*30, 75, 25, bar[c].label);
+        spins[c]->minimum(bar[c].min);
+        spins[c]->maximum(bar[c].max);
+        spins[c]->value  (bar[c].val);
+    }
+    buttons[0]->callback(tap_callback);
+    buttons[1]->callback(stop_callback);
+    buttons[2]->callback(start_callback);
+    w->end();
+
     return 1;
 }
 
@@ -63,4 +121,6 @@ void close_gui(void) {
 }
 
 void main_loop(void) {
+    w->show();
+    Fl::run();
 }