sb-bignum problem on Raspberry Pi with sbcl 1.3.12 (arm-hf)

Hi!
I'm trying to install clack with hunchentoot on my raspberry pi, but while doing a (ql:quickload :clack) I get this error:

   READ error during COMPILE-FILE:
     Symbol "BIGNUM-TYPE" not found in the SB-BIGNUM package.
       Line: 53, Column: 52, File-Position: 2151
       Stream: #<SB-INT:FORM-TRACKING-STREAM for "file /home/pi/quicklisp/dists/quicklisp/software/ironclad_0.33.0/src/digests/digest.lisp" 

I'm using sbcl-hf 1.3.12 (downloaded and install.sh'ed on a bare naked raspbian-lite, fully updated and rebooted, actual quicklisp.

Maybe it's not arm compatible at all, I just wonder.

Thank you!

In the end, it seems it's this bug here:
https://github.com/froydnj/ironclad/issues/74

Best, Gregor