I assume that you are referring to the Ophcrack Live CD distro. Yes, according to distrowatch.com it is based on Slax, which in turn is based on Slackware.
For package installation, Slackware uses
pkgtool. I booted Slax to help and I confirm that it does not have import, so you need to install its package. On the other hand Slackware has (almost) everything. Import can be found on the imagemagick package you can download from a Slackware mirror. If you are using Ophcrack 2.0.1, it uses the same kernel as Slackware 12.1 and so it should be compatable.
ftp://ftp.nluug.nl/pub/os/Linux/dist..._10-i486-1.tgz
Then simply write the command pkgtool and follow the instructions.
Have Fun
Chris