unit Graph in free pascal missing ( pascal in debian )

i want to program in Pascal on debian based distro bunsen labs linux i ve installed free pascal ( code : sudo apt-get install fp-ide fp-compiler fp-units-* fp-utils ) this is sample program code i was trying to compile:

Program Graf;

Uses Crt,Graph;

Var sterownik,tryb,i:Integer;

Begin

Sterownik:=detect;

InitGraph(sterownik,tryb,'');

For i:=1 to 100 do

    Begin

    SetColor(12);

    Circle(i,100,i);

    Setcolor(4);

        Begin

        SetColor(13);

        Bar(500,120,100,200);

    End;

    Setcolor(9);

    Ellipse(500,100,0,360,50,i);

    SetColor(11);

    Circle(i,200,i);

    Setcolor(5);

    Ellipse(500,200,0,360,50,i);

    Begin

    Bar3D(400,200,200,400,50,TopOn);

End;

End;

Delay(1000);

CloseGraph;

End.

i got the compiling error message : can't find unit Graph

what am I doing wrong ? or Is it possible to use unit graph in free pascal ? any help will be appreciated.