Scalpel seg faults on OSX when I use a raw device

So if I try to run Scalpel like this

sudo ./scalpel -o /tmp/scalpel -c scalpel2.conf /dev/rdisk2s2

it segfaults immediately

Does anybody know why?

sudo ./scalpel -o /tmp/scalpel -c scalpel2.conf /dev/rdisk2s2
Scalpel version 1.60
Written by Golden G. Richard III, based on Foremost 0.69.

Opening target "/dev/rdisk2s2"

Image file pass 1/2.
Segmentation fault