diff -ru xemacs-21.5.25.20060327.orig/src/extents.c xemacs-21.5.25.20060327/src/extents.c
--- xemacs-21.5.25.20060327.orig/src/extents.c	2006-03-27 13:37:34.000000000 +0200
+++ xemacs-21.5.25.20060327/src/extents.c	2006-03-27 17:24:00.000000000 +0200
@@ -3121,6 +3121,10 @@
 	    
 	    gb.glyph = glyph;
 	    gb.extent = wrap_extent (e);
+	    /* not used, but necessary to avoid compiler warnings about unitiallized variables */
+	    gb.findex = 0;
+	    gb.active = 0;
+	    gb.width = 0; 
 	    Dynarr_add (ef->begin_glyphs, gb);
 	  }
 	  else if (EQ (glyph, last_glyph))
@@ -3140,6 +3144,10 @@
 
 	    gb.glyph = glyph;
 	    gb.extent = wrap_extent (e);
+	    /* not used, but necessary to avoid compiler warnings about unitiallized variables */
+	    gb.findex = 0;
+	    gb.active = 0;
+	    gb.width = 0; 
 	    Dynarr_add (ef->end_glyphs, gb);
 	  }
 	  else if (EQ (glyph, last_glyph))