If compiler switch InheritFromTStream is not defined, the unit fpspi is not compilable.
Compiling package pascalio 0.0: Exit code 1, Errors:5
fpspi.pas(204,6) Error: Identifier not found "EOSError"
fpspi.pas(204,14) Error: Error in type definition
fpspi.pas(206,8) Error: Identifier not found "EOSError"
fpspi.pas(207,5) Error: Illegal qualifier
fpspi.pas(208,10) Error: class type expected, but got "<erroneous type>"
If compiler switch InheritFromTStream is not defined, the unit fpspi is not compilable.