}
static void
-psppire_dialog_action_histogram_activate (GtkAction *a)
+psppire_dialog_action_histogram_activate (PsppireDialogAction *a)
{
PsppireDialogActionHistogram *act = PSPPIRE_DIALOG_ACTION_HISTOGRAM (a);
PsppireDialogAction *pda = PSPPIRE_DIALOG_ACTION (a);