[Lazarus] Where to define conditionals for FPC

[Bo Berglund]

I know that you can define "custom options" in Lazarus
Project/Options/CompilerOptions/CustomOptions/Defines

These can then be used in constructs like this example:

{$IFDEF USE_LAZSERIAL}
//Code pertaining to LazSerial
{$ELSE}
//Code pertaining to AsyncPro
{$ENDIF}

But if I do not want to use Lazarus, how do I set the conditionals I
want to use?

Something like:
{$DEFINE USE_LAZSERIAL}

written directly in a source file could perhaps be used?

But where do I put this so it will apply to the whole application?
And so that Delphi will also read it if I use the source in Delphi...


-- 
Bo Berglund
Developer in Sweden