#include <cfl.h>
#include <cfl_button.h>
#include <cfl_image.h>
#include <cfl_window.h>
#include <stdlib.h>
void cb(Fl_Widget *w, void *data) { Fl_Widget_set_label(w, "Works!"); }
int main(void) {
Fl_init_all(); Fl_register_images(); Fl_lock(); Fl_Window *w = Fl_Window_new(100, 100, 400, 300, NULL);
Fl_Button *b = Fl_Button_new(160, 210, 80, 40, "Click me");
Fl_Window_end(w);
Fl_Window_show(w);
Fl_Button_set_callback(b, cb, NULL);
return Fl_run();
}