[Chicken-users] import, the utf8 egg, syntax-case and tinyclos

[Sunnan]

I  want to use the ut8 egg, but when I do it complains that it doesn't
know what import is.
Adding
(require-extension syntax-case)
gets rid of that complaint but then instead it complains about my
tinyclos methods:

This is my preamble:
(require-extension syntax-case)
(require-extension tinyclos)
(require-extension utf8)

(declare (uses srfi-1 srfi-13 regex extras))

(import utf8)

and this is the error message:
Error: unbound variable: clean

        Call history:

        ##sys#require
        make-method
        add-method

What should I do? (Note that removing the inclusion of import and
syntax-case makes the program work fine for ascii clean data.)
Sunnan