That's interesting, I get the same error too.
I think this is a bug in CLISP. First, create a file named
"clisptest.lisp" with this in it:
(require 'asdf)
If you (compile-file "clisptest.lisp"), you get an error, but you
shouldn't get that kind of error at compile time; CL:REQUIRE is a
function, and should only have an effect at load time.
I'll report this on the CLISP bug tracker today.
Zach