Gtk2-perl is probably easiest. Try

#!/usr/bin/perl
use Gtk2 '-init';

use GD::Graph;
use GD::Graph::bars;

# almost straignt from the pod
@data = ( 
    ["1st","2nd","3rd","4th","5th","6th","7th", "8th", "9th"],
    [    1,    2,    5,    6,    3,  1.5,    1,     3,     4],
    );

my $graph = GD::Graph::bars->new(400, 300);
$graph->set( 
      x_label           => 'X Label',
      y_label           => 'Y label',
      title             => 'Some simple graph',
      y_max_value       => 8,
      y_tick_number     => 8,
      y_label_skip      => 2 
  ) or die $my_graph->error;

my $gd = $graph->plot(\@data) or die $my_graph->error;
open(IMG, '>file.png') or die $!;
  binmode IMG;
  print IMG $gd->png;
close IMG;

my $win = Gtk2::Window->new;
my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file("file.png") or die "no g
+raph";
my $img = Gtk2::Image->new_from_pixbuf($pixbuf);

my $vbox = Gtk2::VBox->new();

$vbox->pack_start($img, 0,0,0);
$win->add($vbox);
$win->show_all();

Gtk2->main;
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