[plt-scheme] Install Drscheme 300 on FreeBSD

> The error message Drscheme printed on FreeBSD 5.2.1 is:
> "include-bitmap: unable to parse image, originated from:
> /usr/local/plt/collects/icons/turn-down.png"

Do you have PLTHOME or PLTCOLLECTS set in your environment?

What does

  (collection-path "icons")

show?  It should show a path under the installation root
usually under "/usr/local/drscheme".  E.g.-

  #<path:/usr/local/drscheme/collects/icons>

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