> I have a symlink libarpack.so pointing to libarpack.so.2.1 in my
> debian/sid. Does creating it help?

Yes, that made it work.  (It appears the problem was that I installed 
the non-dev version: libarpack2-dev automatically creates this link but 
libarpack2 doesn't.)

To prevent others having the same problems, I suggest that the 
documentation be amended as follows:

Details on website: buildrequires libsuitesparse-dev libarpack2-dev

Readme file, in place of current "Download" section:

DEPENDENCIES
------------

This package is only an Octave binding for ARPACK, and hence requires 
that ARPACK itself be installed.  It also requires libsuitesparse-dev 
and octave3.0-headers.

If your GNU/Linux distribution does not offer ARPACK, it can be obtained 
as a .deb package from http://packages.debian.org/sid/libarpack2-dev

Alternatively, the original source code of ARPACK is available from 
http://www.caam.rice.edu/software/ARPACK/, but as it was not originally 
designed for Linux, you will probably need to edit the configuration 
file ARmake.inc before compiling it.

INSTALLATION
------------

Start Octave, cd to the directory where you saved the package file, and 
run this command:
pkg install arpack-1.0.6.tar.gz

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