[racket] Problem with mzc v.5.1.1 and contracts

Hi!

I'm having a problem with byte-compiled modules and contracts. There are 
2 files, ihash.scm and config-enumerators.scm, both are compiled with

PLTCOLLECTS=/opt/dozor/racket/lib/racket/collects:/home/timur/develop/projects/dozor/build  
LD_LIBRARY_PATH=/opt/dozor/racket/lib:$$LD_LIBRARY_PATH  
/opt/dozor/racket/bin/mzc -z -d . $<
(working string from Makefile).

Small piece of ihash.scm:

#lang racket

(define (ihash? ht)
   (and (hash? ht) (let ((index (hash-ref ht #f #f)))
                     (number? index))))

(provide/contract (ihash-get (-> ihash? any/c any/c any/c)))

(define (ihash-get ihash key default)
   (let ((value (hash-ref ihash key #f)))
     (if value (cdr value) default)))

Small piece of config-enumerators.scm:

#lang racket
(require (lib "ihash.scm" "lib"))
(define (section-replicable? section)
   (car (ihash-get section 'replicable? '(#f))))

Before compilation both scm-s are put to 
/home/timur/develop/projects/dozor/build/lib, compiled and then put to 
/opt/dozor/smap/lib/lib/compiled. $HOME/.racketrc has the next command:
(current-library-collection-paths  (list* "/opt/dozor/smap/lib" 
(current-library-collection-paths)))
Then i run /opt/dozor/racket/bin/mzscheme,
type (require (lib "config-enumerators.scm" "lib")) and get the 
following error:
link: module mismatch, probably from old bytecode whose dependencies 
have changed: variable not provided (directly or indirectly and at the 
expected position) from module: "/opt/dozor/smap/lib/lib/ihash.scm" 
accessed from module: "/opt/dozor/smap/lib/lib/config-enumerators.scm" 
at source phase level: 0 in: provide/contract-contract-id-ihash-get.14

Any ideas?

-- 

Best regards,
Sufiev Timur