+;;; 5 = sbcl-0.6.8 has rearranged static symbols.
+;;; 6 = sbcl-0.6.9, got rid of non-ANSI %DEFCONSTANT/%%DEFCONSTANT stuff
+;;; and deleted a slot from DEBUG-SOURCE structure.
+;;; 7 = around sbcl-0.6.9.8, merged SB-CONDITIONS package into SB-KERNEL
+;;; 8 = sbcl-0.6.10.4 revived Gray stream support, changing stream layouts.
+;;; 9 = deleted obsolete CONS-UNIQUE-TAG bytecode in sbcl-0.6.11.8
+;;; (somewhere in here also changes to AND and OR CTYPE layouts)
+;;; 10 = new layout for CONDITION in sbcl-0.6.11.38
+;;; 11 = new helper functions for MAKE-LOAD-FORM (HASH-TABLE) in
+;;; sbcl-0.6.12.11