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diff --git a/ebus-racket/3rdparty/bzlib/base/version.ss b/ebus-racket/3rdparty/bzlib/base/version.ss
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+#lang scheme/base
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; BASE.plt - common routines that are shared by all other bzlib modules 
+;; 
+;; in a way, base.plt is the most fundamental module of the whole bzlib stack
+;; and as such it also is the lowest level code.  We are not likely to 
+;; fix the code any time soon, and hence any of the functions here are 
+;; explicitly likely to be obsoleted or moved elsewhere. 
+;; 
+;; Proceed with caution. 
+;; 
+;; 
+;; Bonzai Lab, LLC.  All rights reserved.
+;; 
+;; Licensed under LGPL.
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; version.ss - version comparison utilities as well as version-based macros 
+;; yc 1/18/2010 - first version 
+(require (prefix-in v: version/utils)
+         scheme/contract
+         (for-syntax scheme/base
+                     (prefix-in v: version/utils))
+         mzlib/trace
+         )
+
+(define (version? v)
+  (and (string? v)
+       (integer? (v:version->integer v))))
+
+(define (vcomp? comp? v v2 vs) 
+  (apply comp? (map v:version->integer (list* v v2 vs))))
+
+(define (version<? v v2 . vs)
+  (vcomp? < v v2 vs)) 
+;; (trace version<?)
+
+(define (version<=? v v2 . vs) 
+  (vcomp? <= v v2 vs)) 
+;; (trace version<=?)
+
+(define (version>=? v v2 . vs)
+  (vcomp? >= v v2 vs)) 
+;; (trace version>=?)
+
+(define (version>? v v2 . vs)
+  (vcomp? > v v2 vs))
+;; (trace version>?)
+
+(define (version=? v v2 . vs)
+  (vcomp? = v v2 vs)) 
+;; (trace version=?)
+
+(define (version!=? v v2 . vs)
+  (vcomp? (compose not =) v v2 vs))
+;; (trace version!=?)
+
+(define vcomp/c (->* (version? version?)
+                     ()
+                     #:rest (listof version?)
+                     boolean?))
+
+(provide/contract 
+ (version? (-> any/c boolean?))
+ (version<? vcomp/c) 
+ (version<=? vcomp/c)
+ (version>=? vcomp/c) 
+ (version>? vcomp/c) 
+ (version=? vcomp/c)
+ (version!=? vcomp/c)
+ )
+