My guess is that you are missing the Windows
unit from your .dpr file's uses clause. Add that and you will be able to write:
{$SetPEOptFlags IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE}
in your .dpr file. Although clearly you need to write it after the uses clause.
The $SetPEOptFlags
feature was added a few versions before Delphi 2007. And so the error that you are presumably seeing is simply that IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
is not declared. And that is solved by making sure that the symbol is visible in the .dpr file. Clearly you can do that by declaring a constant in the .dpr file, but to avoid duplication I always prefer to add the Windows unit.