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I am unsure if this is even possible in Delphi. I have a GUI, designed for customer use, My employer wishes to have a version of the same software for internal use, where some extra features are available. I intend to put these extra features on an extra TabSheet in a PageControl object. For regular customers, this TabSheet is invisible. My intention was to have two different build configurations: One for customers and one for internal use. Then use a preprocessor symbol to let the code know which configuration it is. However, I have read elsewhere, that Delphi doesn't have a preprocessor, so is this even possible to do? I have defined this symbol in the IDE: Then, in the FormCreate procedure, I have added this line: {$IFDEF __BuilderGUI} TabSheet4.TabVisible := true; {$ENDIF} However, the pascal line is never run. The compiler doesn't seem to "see" the symbol. I've also tried defining the symbol this way (even though I didn't believe in it): If I add {$DEFINE __BuilderGUI} in my code, the $IFDEF recognizes the symbol and acts accordingly. So at least that part works. Am I doing something wrong in the symbol definition, or is what I'm trying to do simply not possible? Should I instead include the $DEFINE in a file that is not included in the customer configuration?