Re: how to detect if gtk2 module is available

[Brett Kosinski <brettk frodo dyn gno org>]

> I have a separate perl module that sets a Tk::fileevent watch if the
> user passes in a Tk window.  Now I want the client to be able to set
> hook up their own events to  Gtk2 via Gtk2::Helper->add_watch.  This
> is simple enough, but the problem I have is that the Gtk2 module is
> not installed everywhere, since a lot of our stuff is still on
> perl-5.6.1.  However, clients do have access to 5.8.0.  How can I
> conditionally test for the availability of Gtk2 inside a module?  I
> still want the 5.6.1 users to have access to this module, but I want
> our 5.8.0 to be able use Gtk2 with this module.

Well, I tend to use a recipe like the following:

BEGIN {
  eval { require Gtk2; import Gtk2 };

  if ($@) {
    print "You don't have Gtk2!";

    $HAVE_GTK2 = 0;
  } else {
    $HAVE_GTK2 = 1;
  }
}

Brett.