I forgot to point out that there is a website with installation information in case it helps:
http://www.wedesoft.demon.co.uk/hornetseye-api/files/Installation-txt.html.
NaturalDocs must be a recent addition to Debian. I wasn't aware of that. I checked the Debian website for the location and if I am not mistaken the configure script will recognise it like this:
./configure --with-ndocs-dir=/usr/share/perl5/naturaldocs
Libjit is required for fast array operations. You can download a version from our website which I have tested with HornetsEye...
HornetsEye is a Ruby real-time computer vision extension. It offers interfaces to do image- and video-I/O with ImageMagick/Magick++, Xine, firewire digital camera (DC1394), and video for linux (V4L).
For more information about HornetsEye have a look at the project homepage: http://hornetseye.sourceforge.net/
This release features...