> I did a crawl (using webhttrack under Linux) and did
> not enable the option to build the "word database". 
> How can I build it without re-crawling everything? 
> The crawl took several days and I can't do it again,
> and I'd rather not write a program to generate the
> index myself.

You may mirror the mirror itself (file://PATH-TO-INDEX), but I would also
suggest to use more advanced indexing systems, because the word database of
HTTrack is really basic.