complex matrix

Hello,

I'm trying to create a complex matrix with:

(make-matrix 2 2 :element-type 'complex-double)

but I have this error:

There is no class named LISP-MATRIX::LA-SIMPLE-MATRIX-NIL
Looking in the source code, it seems there's a way to create such matrices. Correct ?

I'm using Ubuntu 15.10 with SBCL 1.2.14

thanks,
fausto
