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From Odwiki

The HOUDINI_DSO_PATH environment variable is compound path which is traversed by Houdini to search for external plugins to load.

You can find out which directories will be search in the HOUDINI_DSO_PATH (even if the variable isn't set) by running:

  hconfig -ap

Note: You might want to run the command through more or less since its output is long.

The page CustomizingHoudini may have some more information on hconfig.