diff --git a/gtk/simple_dialog.c b/gtk/simple_dialog.c
index 63da30296d..249e19d662 100644
--- a/gtk/simple_dialog.c
+++ b/gtk/simple_dialog.c
@@ -69,7 +69,7 @@ display_simple_dialog(gint type, gint btn_mask, char *message)
   GdkBitmap   *mask;
   GtkStyle    *style;
   GdkColormap *cmap;
-  gchar      **icon;
+  const gchar **icon;
 
   /* Main window */
   switch (type) {
@@ -146,7 +146,7 @@ display_simple_dialog(gint type, gint btn_mask, char *message)
   style = gtk_widget_get_style(win);
   cmap  = gdk_colormap_get_system();
   pixmap = gdk_pixmap_colormap_create_from_xpm_d(NULL, cmap,  &mask,
-    &style->bg[GTK_STATE_NORMAL], icon);
+    &style->bg[GTK_STATE_NORMAL], (gchar **) icon);
   type_pm = gtk_pixmap_new(pixmap, mask);
   gtk_misc_set_alignment (GTK_MISC (type_pm), 0.5, 0.0);
   gtk_container_add(GTK_CONTAINER(top_hb), type_pm);
diff --git a/gtk/tcp_graph.c b/gtk/tcp_graph.c
index 5cb0ac1e6a..480af52c1d 100644
--- a/gtk/tcp_graph.c
+++ b/gtk/tcp_graph.c
@@ -1727,7 +1727,7 @@ static void graph_destroy (struct graph *g)
 	gdk_pixmap_unref (g->pixmap[1]);
 	g_free (g->x_axis);
 	g_free (g->y_axis);
-	g_free (g->title);
+	g_free ( (gpointer) (g->title) );
 	graph_segment_list_free (g);
 	graph_element_lists_free (g);
 #if 0
@@ -2210,7 +2210,7 @@ static void axis_destroy (struct axis *axis)
 {
 	gdk_pixmap_unref (axis->pixmap[0]);
 	gdk_pixmap_unref (axis->pixmap[1]);
-	g_free (axis->label);
+	g_free ( (gpointer) (axis->label) );
 }
 
 static void axis_display (struct axis *axis)
diff --git a/gtk/toolbar.c b/gtk/toolbar.c
index 77a8139c67..a24d0d44f1 100644
--- a/gtk/toolbar.c
+++ b/gtk/toolbar.c
@@ -424,7 +424,7 @@ static void toolbar_append_separator(GtkWidget *toolbar) {
 
 
 #define toolbar_icon(new_icon, window, xpm) { \
-    icon = gdk_pixmap_create_from_xpm_d(window->window, &mask, &window->style->white, xpm); \
+    icon = gdk_pixmap_create_from_xpm_d(window->window, &mask, &window->style->white, (gchar **) xpm); \
     new_icon = gtk_pixmap_new(icon, mask); \
     }
 
diff --git a/gtk/ui_util.c b/gtk/ui_util.c
index 9177cf9eb5..6311c4ab61 100644
--- a/gtk/ui_util.c
+++ b/gtk/ui_util.c
@@ -848,7 +848,7 @@ tree_view_new(GtkTreeModel *model)
 
 #if GTK_MAJOR_VERSION < 2
 GtkWidget *
-ctree_new_with_titles(gint columns, gint tree_column, gchar *titles[])
+ctree_new_with_titles(gint columns, gint tree_column, const gchar *titles[])
 {
   GtkWidget *tree;
 
diff --git a/gtk/ui_util.h b/gtk/ui_util.h
index b037f0a430..99f89541ff 100644
--- a/gtk/ui_util.h
+++ b/gtk/ui_util.h
@@ -246,7 +246,7 @@ extern GtkWidget *ctree_new(gint columns, gint tree_column);
  * @return the newly created GtkCTree
  */
 extern GtkWidget *ctree_new_with_titles(gint columns, gint tree_column,
-				 gchar *titles[]);
+				 const gchar *titles[]);
 #else
 /** Create a GtkTreeView, give it the right styles, and remember it.
  *