[gforth] GFORTHPATH alternative?

[Reepca Russelstein]

It seems that GFORTHPATH, if set, supersedes the install-time
configured places to search for forth source and image files,
including, for example, the current directory. But I just want to
specify additional places to search. Is there a way to do this? I know
'fpath' can be modified, but I'd rather not have to build a wrapper
around gforth that changes it.