diff -Naur fltk-chess.orig/fltk-chess.cxx fltk-chess/fltk-chess.cxx
--- fltk-chess.orig/fltk-chess.cxx	2005-08-25 01:42:28.000000000 +0400
+++ fltk-chess/fltk-chess.cxx	2008-05-17 19:26:57.000000000 +0400
@@ -705,8 +705,8 @@
 
 void cb_P(Fl_Widget * ob, void *p)
 {
-
-    changeP = (char) p;
+    int temp_p = (int) p;
+    changeP = (char) temp_p;
 }
 
 
@@ -881,7 +881,7 @@
 	// close(fdFrom[0]); 
 	// close(fdFrom[1]);
 
-	execl("./gnuchess", NULL);
+	execl("/bin/sh", "/bin/sh", "-c", "exec gnuchess", NULL);
 
     } else {