commander-s docs fail to build

I got commander-s via 

        darcs get
        http://www-pu.informatik.uni-tuebingen.de/users/gasbichl/darcs/commander-s

I guess I got all the patches through 287 (I don't really understand
darcs).

I followed the instructions in DARCS_README, and typed

    $ cd doc
    $ make
    make: *** No rule to make target `man.idx', needed by `man.ind'.  Stop.
    $ 

I'm using GNU Make 3.81, on Ubuntu 6.06.

-- 
Most of what ends up in my essays I only thought of when I sat
down to write them.  That's why I write them.
        -- Paul Graham