How do I include a newline character in a string in Delphi?

const
  sLineBreak = {$IFDEF LINUX} AnsiChar(#10) {$ENDIF}
               {$IFDEF MSWINDOWS} AnsiString(#13#10) {$ENDIF};

label1.Caption := 'Line one'+sLineBreak+'Line two';

Label1.Caption := Memo1.Lines.Text;

MyString := 'Hello,' + ^M + ^J + 'world!';