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Attempt to modify read-only data

I am having trouble with the following test file using 
the 10-26-94 version of clisp under Linux 
(in-package 'user)
(defvar temp-string "Matson, I need you")
(setf (char temp-string 0) #\W)
(print temp-string)
I get the following output

> (load 'test2.lisp)
;; Loading file test2.lisp ...
*** - Attempt to modify read-only data
1. Break> up

EVAL frame for form (SETF (CHAR TEMP-STRING 0) #\W)
1. Break>
It works fine using the dos version of clisp.
Can anyone suggest a way of fixing this?
Bill Barry