[Lazarus] Can't find unit Cairo used by gdk2

[Abbas Ansaripoor]

Error :/usr/share/fpcsrc/2.6.0/packages/gtk2/src/gtk+/gdk/gdk2.pas(32,13) Fatal: Can't find unit Cairo used by gdk2
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Hello Tankyou
I Have Install Lazarus In Debian(7) weezy
Error message Above  send to me  in build process
Plase Help Me To Solve This Problem
my code is very simple
I Attach Picture Of Error

{-Start---------------------------------------------------------------}
unit unitmainfom;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs;

type
  TForm1 = class(TForm)
  private
    { private declarations }
  public
    { public declarations }
  end;

var
  Form1: TForm1;
  i:int;

implementation

{$R *.lfm}
begin
  i=4;
end.                         

{-End---------------------------------------------------------------}
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