Rebuilding $HOME/.R/help.db

I managed to delete my $HOME/.R/help.db

Now help.search("some.topic") reports:
"cannot open file $HOME/.R/help.db"

I can't find any documentation on how to rebuild it.

Regularly, rebuild is done by help.search() automatically if the file is
missing and you haven't changed the defaults for the function nor those
in options(). Look closer if you have changed anything or maybe there
are wrong permissions ...

Uwe Ligges

BTW: The location of the file has changed in R-1.6.0, see the NEWS file.
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