Still MacTCP problems

[cartier@math.uqam.ca (Guillaume Cartier)]

I got the new version of MacTCP from cambridge.apple.com
but it still doesnt work! Is it something I am doing wrong?
I (require :MacTCP) and get the error

> Error: ECASE key NIL is not any of the following:
>         (:STACK-TRAP :REGISTER-TRAP :NO-TRAP)
> While executing: DEFTRAP

When I backtrace I see that this error comes from the following:

(eval-when (:compile-toplevel :execute)
  ; Some traps may not have translated correctly.
  ; I should test whether or not they're defined in the interface files
(rather than whether they're
  ; defined at compile-time), but I don't know how to do so without
offending the sensitive.
  (unless (macro-function 'traps::_SysEnvirons)
    (deftrap _sysenvirons ((versionrequested :signed-integer) (theworld
(:pointer :sysenvrec)))
      (:d0 :signed-integer)
      (:register-trap #xA090 :d0 versionrequested :a0 theworld))))

Thanks for any help.
I am using MCL2.0b1p3 with a MacIIci and system 7.0.

Guillaume Cartier
LACIM, Universite du Quebec a Montreal.
Bureau: (514) 987-4290
E-Mail: cartier@math.uqam.ca