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

[Marco van de Voort]

In our previous episode, Graeme Geldenhuys said:
> Op 2010-06-17 10:39, Marco van de Voort het geskryf:
> > 
> > IIRC delphi has a equivalent of -Ur ({$IMPLICITBUILD OFF}). Were the
> > _original_ components compiled with that?
> 
> It's been over 7 years, so the details are a bit fuzzy.  If I remember
> correctly, Delphi used to like dumping all installed components (and thus
> *.dcu and *.bpl files) in a single directory (I think it was called
> Delphi7\Projects\Bpl\).

Well, it is hard to implement fuzzy details :-)

> If your project then included a new *.pas files with earlier unit search
> path pointing to that new *.pas, it would recompile it and its *.dcu will
> be generated inside your project's output path, thus used instead of the
> original one in the Delphi7\Projects\Bpl path.

Were it third party or components that come with Delphi that you replaced?