Comment 42 for bug 19767

 Cyril BUQUET,

Unfortunately the failure you're having is another example of dash breaking something.

I did what you suggested
1) sudo apt-get install htdig
2) sudo vi /usr/bin/khc_docbookdig.pl
>>> change : my $findpath = "$kdekdehtmldir/$lang/";
>>> with : my $findpath = "$kdehtmldir/$lang/";
(line 94)

But then had to change the sym link for /bin/sh from dash to bash.
3) sudo mv /bin/sh /bin/sh.old
4) sudo ln -s /bin/bash /bin/sh

And then when I re-ran the index build it worked.

Probably would be better to change the script that the help indexer uses to explicitly call /bin/bash instead of /bin/sh though.