http://sourceforge.net/p/flwm/flwm/ci/3938480dc18b56a2eaf3cb9302b6ebfe6cb3064e/tree/Frame.C?diff=11e88c7fc9d5a2817425528742a425f85e7aa0a0
plus the removal of two pointers that don't exist in fltk-1.3.3

--- Frame.C.orig	Sat Jun 27 19:04:40 2015
+++ Frame.C	Sat Jun 27 19:08:51 2015
@@ -6,9 +6,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <FL/fl_draw.H>
-#include "Rotated.H"
 
-
 static Atom wm_state = 0;
 static Atom wm_change_state;
 static Atom wm_protocols;
@@ -438,11 +436,6 @@ int Frame::force_y_onscreen(int Y, int H) {
 // The destructor is called on DestroyNotify, so I don't have to do anything
 // to the contained window, which is already been destroyed.
 
-// fltk bug: it does not clear these pointers when window is deleted,
-// causing flwm to crash on window close sometimes:
-extern Fl_Window *fl_xfocus;
-extern Fl_Window *fl_xmousewin;
-
 Frame::~Frame() {
 
   // It is possible for the frame to be destroyed while the menu is
@@ -455,8 +448,6 @@ Frame::~Frame() {
 
 #if FL_MAJOR_VERSION < 2
   // fix fltk bug:
-  fl_xfocus = 0;
-  fl_xmousewin = 0;
   Fl::focus_ = 0;
 #endif
 
@@ -1262,6 +1253,7 @@ void Frame::draw() {
 # endif
 #endif
     if (!flag(THIN_BORDER) && label_h > 3) {
+      fl_push_clip(1, label_y, left, label_h);
 #ifdef SHOW_CLOCK
       if (active()) {
 	  int clkw = int(fl_width(clock_buf));
@@ -1280,8 +1272,9 @@ void Frame::draw() {
 	  // and the window height is short enough.  For now, we'll
 	  // assume this is not enough of a problem to be concerned
 	  // about.
-	  draw_rotated90(clock_buf, 1, label_y+3, left-1, label_h-6,
-			 Fl_Align(FL_ALIGN_BOTTOM|FL_ALIGN_CLIP));
+	  fl_draw(90, clock_buf,
+	          (left + fl_height() + 1)/2 - fl_descent(),
+	          label_y+label_h-3);
       } else
 	  // Only show the clock on the active frame.
 	  XClearArea(fl_display, fl_xid(this), 1, label_y+3,
@@ -1289,8 +1282,10 @@ void Frame::draw() {
 #endif      
       fl_color(labelcolor());
       fl_font(TITLE_FONT_SLOT, TITLE_FONT_SIZE);
-      draw_rotated90(label(), 1, label_y+3, left-1, label_h-3,
-		     Fl_Align(FL_ALIGN_TOP|FL_ALIGN_CLIP));
+      fl_draw(90, label(),
+	      (left + fl_height() + 1)/2 - fl_descent(),
+	      label_y+3+fl_width(label()));
+      fl_pop_clip();
     }
   }
 }