{$IFDEF VER80}  - Delphi 1
{$IFDEF VER90}  - Delphi 2
{$IFDEF VER100} - Delphi 3
{$IFDEF VER120} - Delphi 4
{$IFDEF VER130} - Delphi 5
{$IFDEF VER140} - Delphi 6
{$IFDEF VER150} - Delphi 7
{$IFDEF VER160} - Delphi 8
{$IFDEF VER170} - Delphi 2005
{$IFDEF VER180} - Delphi 2006
{$IFDEF VER180} - Delphi 2007
{$IFDEF VER185} - Delphi 2007
{$IFDEF VER200} - Delphi 2009
{$IFDEF VER210} - Delphi 2010
{$IFDEF VER220} - Delphi XE
{$IFDEF VER230} - Delphi XE2

{$IF CompilerVersion >= 18.5}
//some code only compiled for Delphi 2007 and later
{$IFEND}

Delphi XE2  - 23
Delphi XE   - 22
Delphi 2010 - 21
Delphi 2009 - 20
Delphi 2007 - 18.5
Delphi 2006 - 18
Delphi 2005 - 17
Delphi 8    - 16
Delphi 7    - 15
Delphi 6    - 14