diff --git a/lcl/interfaces/gtk3/gtk3bindings/lazgdk3.pas b/lcl/interfaces/gtk3/gtk3bindings/lazgdk3.pas
index c0f019ea1a..36b30f1a41 100644
--- a/lcl/interfaces/gtk3/gtk3bindings/lazgdk3.pas
+++ b/lcl/interfaces/gtk3/gtk3bindings/lazgdk3.pas
@@ -2689,6 +2689,25 @@ type
   GDK_TOUCH_CANCEL = 40,
   GDK_EVENT_LAST = 41
   );
+  TGdkScrollDirection = (
+    TGdkScrollDirectionMinValue = -$7FFFFFFF,
+    GDK_SCROLL_UP = 0,
+    GDK_SCROLL_DOWN = 1,
+    GDK_SCROLL_LEFT = 2,
+    GDK_SCROLL_RIGHT = 3,
+    GDK_SCROLL_SMOOTH = 4,
+    TGdkScrollDirectionMaxValue = $7FFFFFFF
+  );
+  TGdkVisualType = (
+    TGdkVisualTypeMinValue = -$7FFFFFFF,
+    GDK_VISUAL_STATIC_GRAY = 0,
+    GDK_VISUAL_GRAYSCALE = 1,
+    GDK_VISUAL_STATIC_COLOR = 2,
+    GDK_VISUAL_PSEUDO_COLOR = 3,
+    GDK_VISUAL_TRUE_COLOR = 4,
+    GDK_VISUAL_DIRECT_COLOR = 5,
+    TGdkVisualTypeMaxValue = $7FFFFFFF
+  );
 
 type
   TGdkVisibilityState = Integer;
@@ -2698,16 +2717,6 @@ const
   GDK_VISIBILITY_PARTIAL: TGdkVisibilityState = 1;
   GDK_VISIBILITY_FULLY_OBSCURED: TGdkVisibilityState = 2;
 
-type
-  TGdkScrollDirection = Integer;
-const
-  { GdkScrollDirection }
-  GDK_SCROLL_UP: TGdkScrollDirection = 0;
-  GDK_SCROLL_DOWN: TGdkScrollDirection = 1;
-  GDK_SCROLL_LEFT: TGdkScrollDirection = 2;
-  GDK_SCROLL_RIGHT: TGdkScrollDirection = 3;
-  GDK_SCROLL_SMOOTH: TGdkScrollDirection = 4;
-
 type
   TGdkNotifyType = Integer;
 const
@@ -2820,17 +2829,6 @@ const
   GDK_PROP_MODE_PREPEND: TGdkPropMode = 1;
   GDK_PROP_MODE_APPEND: TGdkPropMode = 2;
 
-type
-  TGdkVisualType = Integer;
-const
-  { GdkVisualType }
-  GDK_VISUAL_STATIC_GRAY: TGdkVisualType = 0;
-  GDK_VISUAL_GRAYSCALE: TGdkVisualType = 1;
-  GDK_VISUAL_STATIC_COLOR: TGdkVisualType = 2;
-  GDK_VISUAL_PSEUDO_COLOR: TGdkVisualType = 3;
-  GDK_VISUAL_TRUE_COLOR: TGdkVisualType = 4;
-  GDK_VISUAL_DIRECT_COLOR: TGdkVisualType = 5;
-
 type
   TGdkStatus = Integer;
 const
diff --git a/lcl/interfaces/gtk3/gtk3bindings/lazgtk3.pas b/lcl/interfaces/gtk3/gtk3bindings/lazgtk3.pas
index 5a2cbcd8ea..180a86c6a5 100644
--- a/lcl/interfaces/gtk3/gtk3bindings/lazgtk3.pas
+++ b/lcl/interfaces/gtk3/gtk3bindings/lazgtk3.pas
@@ -907,6 +907,12 @@ type
     GTK_LEVEL_BAR_MODE_DISCRETE = 1,
     TGtkLevelBarModeMaxValue = $7FFFFFFF
   );
+  TGtkSortType = (
+    TGtkSortTypeMinValue = -$7FFFFFFF,
+    GTK_SORT_ASCENDING = 0,
+    GTK_SORT_DESCENDING = 1,
+    TGtkSortTypeMaxValue = $7FFFFFFF
+  );
   TGtkPackDirection = (
     TGtkPackDirectionMinValue = -$7FFFFFFF,
     GTK_PACK_DIRECTION_LTR = 0,
@@ -1220,6 +1226,13 @@ type
     GTK_TOOL_PALETTE_DRAG_GROUPS = 2,
     TGtkToolPaletteDragTargetsMaxValue = $7FFFFFFF
   );
+  TGtkTreeViewColumnSizing = (
+    TGtkTreeViewColumnSizingMinValue = -$7FFFFFFF,
+    GTK_TREE_VIEW_COLUMN_GROW_ONLY = 0,
+    GTK_TREE_VIEW_COLUMN_AUTOSIZE = 1,
+    GTK_TREE_VIEW_COLUMN_FIXED = 2,
+    TGtkTreeViewColumnSizingMaxValue = $7FFFFFFF
+  );
   TGtkTreeViewDropPosition = (
     TGtkTreeViewDropPositionMinValue = -$7FFFFFFF,
     GTK_TREE_VIEW_DROP_BEFORE = 0,
@@ -1298,13 +1311,6 @@ const
   GTK_ICON_LOOKUP_GENERIC_FALLBACK: TGtkIconLookupFlags = 8;
   GTK_ICON_LOOKUP_FORCE_SIZE: TGtkIconLookupFlags = 16;
 
-type
-  TGtkSortType = Integer;
-const
-  { GtkSortType }
-  GTK_SORT_ASCENDING: TGtkSortType = 0;
-  GTK_SORT_DESCENDING: TGtkSortType = 1;
-
 type
   TGtkRcTokenType = Integer;
 const
@@ -1385,14 +1391,6 @@ const
   GTK_TOOLBAR_SPACE_EMPTY: TGtkToolbarSpaceStyle = 0;
   GTK_TOOLBAR_SPACE_LINE: TGtkToolbarSpaceStyle = 1;
 
-type
-  TGtkTreeViewColumnSizing = Integer;
-const
-  { GtkTreeViewColumnSizing }
-  GTK_TREE_VIEW_COLUMN_GROW_ONLY: TGtkTreeViewColumnSizing = 0;
-  GTK_TREE_VIEW_COLUMN_AUTOSIZE: TGtkTreeViewColumnSizing = 1;
-  GTK_TREE_VIEW_COLUMN_FIXED: TGtkTreeViewColumnSizing = 2;
-
 type
   TGtkUIManagerItemType = Integer;
 const
diff --git a/lcl/interfaces/gtk3/gtk3lclintf.inc b/lcl/interfaces/gtk3/gtk3lclintf.inc
index 1a71464c58..81f713c639 100644
--- a/lcl/interfaces/gtk3/gtk3lclintf.inc
+++ b/lcl/interfaces/gtk3/gtk3lclintf.inc
@@ -598,12 +598,12 @@ begin
   end else
   begin
     case Visual^.get_visual_type of
-      0 {GDK_VISUAL_STATIC_GRAY}:  ADesc.Format:=ricfGray;
-      1 {GDK_VISUAL_GRAYSCALE}:    ADesc.Format:=ricfGray;
-      2 {GDK_VISUAL_STATIC_COLOR}: ADesc.Format:=ricfGray; // this is not really gray, but an index in a color map, but colormaps are not supported yet, so use gray
-      3 {GDK_VISUAL_PSEUDO_COLOR}: ADesc.Format:=ricfGray;
-      4 {GDK_VISUAL_TRUE_COLOR}:   ADesc.Format:=ricfRGBA;
-      5 {GDK_VISUAL_DIRECT_COLOR}: ADesc.Format:=ricfRGBA;
+      GDK_VISUAL_STATIC_GRAY {0} :  ADesc.Format:=ricfGray;
+      GDK_VISUAL_GRAYSCALE {1} :    ADesc.Format:=ricfGray;
+      GDK_VISUAL_STATIC_COLOR {2} : ADesc.Format:=ricfGray; // this is not really gray, but an index in a color map, but colormaps are not supported yet, so use gray
+      GDK_VISUAL_PSEUDO_COLOR {3} : ADesc.Format:=ricfGray;
+      GDK_VISUAL_TRUE_COLOR {4} :   ADesc.Format:=ricfRGBA;
+      GDK_VISUAL_DIRECT_COLOR {5} : ADesc.Format:=ricfRGBA;
     else
       DebugLn('TGtk3WidgetSet.GetWindowRawImageDescription unknown Visual type ',
               dbgs(Integer(Visual^.get_visual_type)));
diff --git a/lcl/interfaces/gtk3/gtk3widgets.pas b/lcl/interfaces/gtk3/gtk3widgets.pas
index d3e54b970d..6446bea587 100644
--- a/lcl/interfaces/gtk3/gtk3widgets.pas
+++ b/lcl/interfaces/gtk3/gtk3widgets.pas
@@ -1616,10 +1616,10 @@ begin
   {$ENDIF}
   Result := False;
   case AEvent^.scroll.direction of
-    0, 1{GDK_SCROLL_UP,
-    GDK_SCROLL_DOWN}: Msg.Msg := LM_VSCROLL;
-    2, 3{GDK_SCROLL_LEFT,
-    GDK_SCROLL_RIGHT}: Msg.Msg := LM_HSCROLL;
+    GDK_SCROLL_UP, {0}
+    GDK_SCROLL_DOWN {1}: Msg.Msg := LM_VSCROLL;
+    GDK_SCROLL_LEFT, {2}
+    GDK_SCROLL_RIGHT {3}: Msg.Msg := LM_HSCROLL;
     else
       begin
         if AEvent^.scroll.direction = GDK_SCROLL_SMOOTH then
@@ -1697,8 +1697,8 @@ begin
   FillChar(MessE{%H-},SizeOf(MessE),0);
   MessE.Msg := LM_MOUSEWHEEL;
   case AEvent^.scroll.direction of
-    0 {GDK_SCROLL_UP}: MessE.WheelDelta := 120;
-    1 {GDK_SCROLL_DOWN}: MessE.WheelDelta := -120;
+    GDK_SCROLL_UP {0}: MessE.WheelDelta := 120;
+    GDK_SCROLL_DOWN {1}: MessE.WheelDelta := -120;
   else
     exit;
   end;
@@ -6241,8 +6241,8 @@ procedure TGtk3ListView.SetColumnAutoSize(AIndex: Integer;
   AColumn: TListColumn; AAutoSize: Boolean);
 const
   SizingMap: array[Boolean] of TGtkTreeViewColumnSizing = (
-    2 {GTK_TREE_VIEW_COLUMN_FIXED},
-    1 {GTK_TREE_VIEW_COLUMN_AUTOSIZE}
+    GTK_TREE_VIEW_COLUMN_FIXED {2},
+    GTK_TREE_VIEW_COLUMN_AUTOSIZE {1}
   );
 var
   AGtkColumn: PGtkTreeViewColumn;
@@ -6332,7 +6332,7 @@ end;
 procedure TGtk3ListView.ColumnSetSortIndicator(const AIndex: Integer;
   const AColumn: TListColumn; const ASortIndicator: TSortIndicator);
 const
-  GtkOrder : array [ TSortIndicator] of TGtkSortType = (0, {GTK_SORT_ASCENDING}0, {GTK_SORT_DESCENDING}1);
+  GtkOrder : array [ TSortIndicator] of TGtkSortType = (GTK_SORT_ASCENDING {0}, GTK_SORT_ASCENDING {0}, GTK_SORT_DESCENDING {1});
 var
   AGtkColumn: PGtkTreeViewColumn;
 begin