[plt-scheme] is dynamic-require or namespace used here?

> Then set PLTCOLLECTS to /local/mylib/collects/: or /local/reallib/collects/:
> depending on which library you want to test (the ":" is needed if you want to
> use libraries in the default collection paths as well).
>
> HTH
>
> -d
>

How do I set PLTCOLLECTS?  I can only find
(current-library-collection-paths) in the Helpdesk.

Thanks.