Found the following significant warnings:
  atkClasses.c:1054:25: warning: incompatible pointer types assigning to 'void (*)(AtkObject *, guint, gpointer)' (aka 'void (*)(struct _AtkObject *, unsigned int, void *)') from 'void (AtkObject *, guint, AtkObject *)' (aka 'void (struct _AtkObject *, unsigned int, struct _AtkObject *)') [-Wincompatible-pointer-types]
  atkClasses.c:1062:34: warning: incompatible pointer types assigning to 'void (*)(AtkObject *, gpointer *)' (aka 'void (*)(struct _AtkObject *, void **)') from 'void (AtkObject *, AtkObject *)' (aka 'void (struct _AtkObject *, struct _AtkObject *)') [-Wincompatible-pointer-types]
  atkClasses.c:1401:51: warning: incompatible pointer types passing 'AtkObject *' (aka 'struct _AtkObject *') to parameter of type 'gpointer *' (aka 'void **') [-Wincompatible-pointer-types]
  atkFuncs.c:230:3: warning: 'atk_component_get_position' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:251:3: warning: 'atk_component_get_size' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:287:3: warning: 'atk_component_remove_focus_handler' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:407:9: warning: 'atk_document_get_document_type' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:423:9: warning: 'atk_document_get_document' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:729:9: warning: 'atk_hyperlink_is_selected_link' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:1183:9: warning: 'atk_object_get_layer' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:1199:9: warning: 'atk_object_get_mdi_zorder' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:1307:3: warning: 'atk_object_remove_property_change_handler' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2164:9: warning: 'atk_table_get_index_at' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2181:9: warning: 'atk_table_get_column_at_index' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2198:9: warning: 'atk_table_get_row_at_index' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2693:9: warning: 'atk_text_get_text_after_offset' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2719:9: warning: 'atk_text_get_text_at_offset' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:2745:9: warning: 'atk_text_get_text_before_offset' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3136:3: warning: 'atk_remove_focus_tracker' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3150:3: warning: 'atk_focus_tracker_notify' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3286:3: warning: 'atk_value_get_current_value' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3306:3: warning: 'atk_value_get_maximum_value' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3326:3: warning: 'atk_value_get_minimum_value' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3347:9: warning: 'atk_value_set_current_value' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3397:9: warning: 'atk_role_register' is deprecated [-Wdeprecated-declarations]
  atkFuncs.c:3481:9: warning: 'atk_document_get_locale' is deprecated [-Wdeprecated-declarations]
  gdkFuncs.c:6000:36: warning: incompatible pointer types passing 'GtkWidget **' (aka 'struct _GtkWidget **') to parameter of type 'gpointer *' (aka 'void **') [-Wincompatible-pointer-types]
  gdkFuncs.c:7588:9: warning: 'gdk_pixbuf_new_from_inline' is deprecated [-Wdeprecated-declarations]
  gioClasses.c:1974:17: warning: incompatible pointer types assigning to 'gssize (*)(GOutputStream *, const void *, gsize, GCancellable *, GError **)' (aka 'long (*)(struct _GOutputStream *, const void *, unsigned long, struct _GCancellable *, struct _GError **)') from 'gssize (GOutputStream *, const guchar *, gsize, GCancellable *, GError **)' (aka 'long (struct _GOutputStream *, const unsigned char *, unsigned long, struct _GCancellable *, struct _GError **)') [-Wincompatible-pointer-types]
  gioClasses.c:1990:20: warning: incompatible pointer types assigning to 'void (*)(GOutputStream *, const void *, gsize, int, GCancellable *, GAsyncReadyCallback, gpointer)' (aka 'void (*)(struct _GOutputStream *, const void *, unsigned long, int, struct _GCancellable *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)') from 'void (GOutputStream *, const guchar *, gsize, int, GCancellable *, GAsyncReadyCallback, gpointer)' (aka 'void (struct _GOutputStream *, const unsigned char *, unsigned long, int, struct _GCancellable *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)') [-Wincompatible-pointer-types]
  gioFuncs.c:1844:9: warning: 'g_data_input_stream_read_until' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:2369:3: warning: 'g_drive_eject' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:2390:9: warning: 'g_drive_eject_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:4654:3: warning: 'g_file_unmount_mountable' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:4675:9: warning: 'g_file_unmount_mountable_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:4702:3: warning: 'g_file_eject_mountable' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:4723:9: warning: 'g_file_eject_mountable_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:7595:3: warning: 'g_io_scheduler_cancel_all_jobs' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:7617:9: warning: 'g_io_scheduler_job_send_to_mainloop' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:7639:3: warning: 'g_io_scheduler_job_send_to_mainloop_async' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:8078:3: warning: 'g_mount_unmount' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:8099:9: warning: 'g_mount_unmount_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:8126:3: warning: 'g_mount_eject' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:8147:9: warning: 'g_mount_eject_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9121:9: warning: 'g_simple_async_result_new' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9144:9: warning: 'g_simple_async_result_new_from_error' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9169:3: warning: 'g_simple_async_result_set_op_res_gpointer' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9188:9: warning: 'g_simple_async_result_get_op_res_gpointer' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9208:3: warning: 'g_simple_async_result_set_op_res_gssize' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9227:9: warning: 'g_simple_async_result_get_op_res_gssize' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9247:3: warning: 'g_simple_async_result_set_op_res_gboolean' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9266:9: warning: 'g_simple_async_result_get_op_res_gboolean' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9286:9: warning: 'g_simple_async_result_get_source_tag' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9306:3: warning: 'g_simple_async_result_set_handle_cancellation' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9324:3: warning: 'g_simple_async_result_complete' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9342:3: warning: 'g_simple_async_result_complete_in_idle' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9361:3: warning: 'g_simple_async_result_set_from_error' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9385:9: warning: 'g_simple_async_result_propagate_error' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9411:3: warning: 'g_simple_async_report_gerror_in_idle' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9947:3: warning: 'g_volume_eject' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:9968:9: warning: 'g_volume_eject_finish' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:10135:9: warning: 'g_volume_monitor_adopt_orphan_mount' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:10972:3: warning: 'g_data_input_stream_read_until_async' is deprecated [-Wdeprecated-declarations]
  gioFuncs.c:10994:9: warning: 'g_data_input_stream_read_until_finish' is deprecated [-Wdeprecated-declarations]
  gioManuals.c:151:9: warning: 'g_simple_async_result_new_error' is deprecated [-Wdeprecated-declarations]
  gioManuals.c:173:3: warning: 'g_simple_async_result_set_error' is deprecated [-Wdeprecated-declarations]
  gioManuals.c:199:3: warning: 'g_simple_async_report_error_in_idle' is deprecated [-Wdeprecated-declarations]
  gioManuals.c:239:3: warning: 'g_async_initable_newv_async' is deprecated [-Wdeprecated-declarations]
  gioManuals.c:274:9: warning: 'g_initable_newv' is deprecated [-Wdeprecated-declarations]
  gobject.c:352:8: warning: 'g_object_newv' is deprecated [-Wdeprecated-declarations]
  gobject.c:412:15: warning: 'g_object_newv' is deprecated [-Wdeprecated-declarations]
  gobject.c:416:18: warning: 'g_object_newv' is deprecated [-Wdeprecated-declarations]
  gtkClasses.c:8831:28: warning: incompatible pointer types assigning to 'gboolean (*)(GtkNotebook *, gint)' (aka 'int (*)(struct _GtkNotebook *, int)') from 'void (GtkNotebook *, gint)' (aka 'void (struct _GtkNotebook *, int)') [-Wincompatible-pointer-types]
  gtkClasses.c:11314:21: warning: incompatible pointer types assigning to 'gboolean (*)(GtkScrolledWindow *, GtkScrollType, gboolean)' (aka 'int (*)(struct _GtkScrolledWindow *, GtkScrollType, int)') from 'void (GtkScrolledWindow *, GtkScrollType, gboolean)' (aka 'void (struct _GtkScrolledWindow *, GtkScrollType, int)') [-Wincompatible-pointer-types]
  pangoFuncs.c:890:9: warning: 'pango_cairo_font_map_create_context' is deprecated [-Wdeprecated-declarations]
  pangoFuncs.c:1159:9: warning: 'pango_get_mirror_char' is deprecated [-Wdeprecated-declarations]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/RGtk2.Rcheck/00install.out' for details.