The {$PIC } directive takes a boolean argument and tells the compiler whether it should generate PIC (Position Independent Code) or not. This directive is the equivalent of the -Cg command line switch.
This directive is only useful on Unix platforms: Units should be compiled using PIC code if they are supposed to be in a library. For programs, using PIC code is not needed, but it doesn’t hurt either (although PIC code is slower).
The following
{$PIC ON}
unit MyUnit;
tells the compiler to compile myunit using PIC code.