I actually ran into this issue before you can see Beaudoin's response here in the archive:
http://lists.common-lisp.net/pipermail/mkcl-devel/2011-June/000008.html 

On Mon, Apr 30, 2012 at 1:36 PM, Kaïraba Cissé <ckairaba@gmail.com> wrote:
Hi
I want to understand why I get an arror when I try the following command on mkcl 1.1.0 (gnu/linux - x86) :
(truename *default-pathname-defaults*)
Normally, *default-pathname-defaults* must be initialzed to the current directory at start-up. But the return value is "".
If we can initialized the value to "./" or get the working directory path it would be better.
Cheers


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