diff -ru freetype-2.1.4/include/freetype/freetype.h freetype2/include/freetype/freetype.h
--- freetype-2.1.4/include/freetype/freetype.h  2003-01-16 00:43:17.000000000 +0100
+++ freetype2/include/freetype/freetype.h       2003-07-01 05:53:32.000000000 +0200
@@ -196,6 +196,9 @@
     FT_Pos  vertBearingY;  /* top side bearing in vertical layouts  */
     FT_Pos  vertAdvance;   /* advance height for vertical layout    */

+    FT_Pos  kern_left_err;   /* error due to rounding left boundary  */
+    FT_Pos  kern_right_err;  /* error due to rounding right boundary */
+
   } FT_Glyph_Metrics;

diff -ru freetype-2.1.4/src/autohint/ahhint.c freetype2/src/autohint/ahhint.c
--- freetype-2.1.4/src/autohint/ahhint.c        2003-03-20 21:58:56.000000000 +0100
+++ freetype2/src/autohint/ahhint.c     2003-07-01 06:04:44.000000000 +0200
@@ -1414,7 +1414,7 @@
       /* we now need to hint the metrics according to the change in */
       /* width/positioning that occured during the hinting process  */
       {
-        FT_Pos   old_advance, old_rsb, old_lsb, new_lsb;
+        FT_Pos   old_advance, old_rsb, old_lsb, new_lsb, pp1x_uh, pp2x_uh;
         AH_Edge  edge1 = outline->vert_edges;     /* leftmost edge  */
         AH_Edge  edge2 = edge1 +
                          outline->num_vedges - 1; /* rightmost edge */
@@ -1425,9 +1425,15 @@
         old_lsb     = edge1->opos;
         new_lsb     = edge1->pos;

+        pp1x_uh = new_lsb    - old_lsb;
+        pp2x_uh = edge2->pos + old_rsb;
+
         hinter->pp1.x = ( ( new_lsb    - old_lsb ) + 32 ) & -64;
         hinter->pp2.x = ( ( edge2->pos + old_rsb ) + 32 ) & -64;

+        slot->metrics.kern_left_err  = hinter->pp1.x - pp1x_uh;
+        slot->metrics.kern_right_err = hinter->pp2.x - pp2x_uh;
+
 #if 0
         /* try to fix certain bad advance computations */
         if ( hinter->pp2.x + hinter->pp1.x == edge2->pos && old_rsb > 4 )