--- ./../../gtk/src/gtk_signals.defs.orig	2020-03-09 10:31:50.493450723 +0100
+++ ./../../gtk/src/gtk_signals.defs	2020-03-09 16:01:03.199478606 +0100
@@ -2275,11 +2275,11 @@
 (define-signal color-activated
   (of-object "GtkColorChooser")
   (return-type "void")
   (flags "Run First")
   (parameters
-    '("GdkRGBA*" "p0")
+    '("const-GdkRGBA*" "p0")
   )
 )
 
 (define-property rgba
   (of-object "GtkColorChooser")
@@ -2341,11 +2341,11 @@
   (flags "Run Last, Action")
 )
 
 (define-signal format-entry-text
   (of-object "GtkComboBox")
-  (return-type "const-gchar*")
+  (return-type "gchar*")
   (flags "Run Last")
   (parameters
     '("const-gchar*" "p0")
   )
 )
@@ -2686,11 +2686,11 @@
   (of-object "GtkCssProvider")
   (return-type "void")
   (flags "Run Last")
   (parameters
     '("GtkCssSection*" "p0")
-    '("GError*" "p1")
+    '("const-GError*" "p1")
   )
 )
 
 ;; From GtkDialog
 
@@ -2874,11 +2874,11 @@
 (define-signal drop
   (of-object "GtkDropTarget")
   (return-type "gboolean")
   (flags "Run Last")
   (parameters
-    '("GValue*" "p0")
+    '("const-GValue*" "p0")
     '("gdouble" "p1")
     '("gdouble" "p2")
   )
 )
 
@@ -7397,11 +7397,11 @@
   )
 )
 
 (define-signal create-custom-widget
   (of-object "GtkPrintOperation")
-  (return-type "GObject*")
+  (return-type "GtkWidget*")
   (flags "Run Last")
 )
 
 (define-signal update-custom-widget
   (of-object "GtkPrintOperation")
@@ -9249,11 +9249,11 @@
 (define-signal input
   (of-object "GtkSpinButton")
   (return-type "gint")
   (flags "Run Last")
   (parameters
-    '("gpointer" "p0")
+    '("double*" "p0")
   )
 )
 
 (define-signal output
   (of-object "GtkSpinButton")
@@ -9924,11 +9924,11 @@
 (define-signal mark-set
   (of-object "GtkTextBuffer")
   (return-type "void")
   (flags "Run Last")
   (parameters
-    '("GtkTextIter*" "p0")
+    '("const-GtkTextIter*" "p0")
     '("GtkTextMark*" "p1")
   )
 )
 
 (define-signal mark-deleted
@@ -9944,23 +9944,23 @@
   (of-object "GtkTextBuffer")
   (return-type "void")
   (flags "Run Last")
   (parameters
     '("GtkTextTag*" "p0")
-    '("GtkTextIter*" "p1")
-    '("GtkTextIter*" "p2")
+    '("const-GtkTextIter*" "p1")
+    '("const-GtkTextIter*" "p2")
   )
 )
 
 (define-signal remove-tag
   (of-object "GtkTextBuffer")
   (return-type "void")
   (flags "Run Last")
   (parameters
     '("GtkTextTag*" "p0")
-    '("GtkTextIter*" "p1")
-    '("GtkTextIter*" "p2")
+    '("const-GtkTextIter*" "p1")
+    '("const-GtkTextIter*" "p2")
   )
 )
 
 (define-signal begin-user-action
   (of-object "GtkTextBuffer")
@@ -11232,11 +11232,11 @@
   (return-type "void")
   (flags "Run First")
   (parameters
     '("GtkTreePath*" "p0")
     '("GtkTreeIter*" "p1")
-    '("gpointer" "p2")
+    '("gint*" "p2")
   )
 )
 
 ;; From GtkTreeSelection
 
