O.K. Thaddy, I have found the (sic !!) solution. There is a mistake in fp-ide :
The solution to introduce system.ppu :
You open the IDE by the fp command.
The Tp7-like EDI screen is opened .
You click on "Options" .
You click on "Directories...'
and then like for Ptc stuff you add the Directory of the PASCAL unit system :
/usr/lib/arm-linux-gnueabihf/fpc/3.0.4/units/arm-linux/rtl/
and I have the greeting messages I was waiting for :
>>Fp ... a l'aise Blaise, dans Busher.<<
>>C'est Tout, les Mecs!!!! / That's All, Folks !!!!<<
Voili, Voilou, Voila !
Merci pour votre aide Thaddy. Friendly yours. Yves.