Problem to make a pkg

[Fredrik Lingvall]

I'm trying add pkg support for a toolbox for acoustic simulations
(http://www.signal.uu.se/Toolbox/dream/) but I get this error:

octave:3> pkg install dream-2.1.0.tar.gz
error: bundles of packages are not allowed
error: called from `pkg:install' in file 
/usr/local//share/octave/3.0.0/m/pkg/pkg.m near line 552, column 4

which I'm not sure what it means.

The package dir contains:

ls -l dream-2.1.0/

total 27
-rw-r--r-- 1 root root 18011 2008-01-19 19:00 COPYING
-rw-r--r-- 1 root root    18 2008-01-19 19:00 DATE
drwxr-xr-x 2 root root    80 2008-01-19 19:00 doc
drwxr-xr-x 2 root root    48 2008-01-19 19:00 inst
drwxr-xr-x 2 root root  2744 2008-01-19 19:00 src

where the inst dir is empty and src contains header, C/C++ files, and a 
Makefile.

What am I doing wrong here?

/Fredrik