[fpc-pascal] A patched unit overriding the default - like Delphi supports

[Marco van de Voort]

In our previous episode, Graeme Geldenhuys said:
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> Hi,
> 
> Many years ago when I still used Delphi, it was common in our
> development team to create our own patches for various components we
> used. We then placed those "fixed" units in a new path and add that
> path to the Delphi IDE (can't remember if the new path at to be on the
> top or bottom of the list).
> 
> Delphi would then read the newer unit instead of the older unit by
> default. No need to modify the original unit.
> 
> Is something like this supported by Free Pascal?  If I place the copy
> of an existing RTL or FCL unit in a new path and add that new path as
> the first search path of FPC?

Not an answer, but a question about how this would work:

IIRC delphi has a equivalent of -Ur ({$IMPLICITBUILD OFF}). Were the
_original_ components compiled with that?