The Changes
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In manndoor.pas, I added this bit before "interface"..

(* To enable ddplus compatibility, enable this *)
{$DEFINE DDPLUS_COMPAT}

In the interface section, I added:

{$IFDEF DDPLUS_COMPAT}
{$I ddplus.int}
{$ENDIF}

In the implementation section, I added:

{$IFDEF DDPLUS_COMPAT}
{$I ddplus.imp}
{$ENDIF}