2 files changed, 39 insertions, 2 deletions
diff --git a/dev-ada/gtkada/files/gtkada-25.0.1-gcc16.patch b/dev-ada/gtkada/files/gtkada-25.0.1-gcc16.patch
new file mode 100644
index 000000000000..e07fafa47068
--- /dev/null
+++ b/dev-ada/gtkada/files/gtkada-25.0.1-gcc16.patch
@@ -0,0 +1,34 @@
+From 26be71ad32cb5edd4c2bf5b45e92e2ae664eb957 Mon Sep 17 00:00:00 2001
+From: Javier Miranda <miranda@adacore.com>
+Date: Sat, 4 Oct 2025 07:06:34 +0000
+Subject: [PATCH] Fix sources after enforcing RM 8.6(27.1) in the compiler
+
+* gtkada-canvas_view.ads (Inner_Most_Item): Add explicit type conversion.
+
+For eng/toolchain/gnat#1292
+---
+ src/gtkada-canvas_view.ads | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/gtkada-canvas_view.ads b/src/gtkada-canvas_view.ads
+index 6038fe8cc..7ad5321af 100644
+--- a/src/gtkada-canvas_view.ads
++++ b/src/gtkada-canvas_view.ads
+@@ -589,7 +589,7 @@ package Gtkada.Canvas_View is
+      (Self           : not null access Canvas_Item_Record;
+       Dummy_At_Point : Model_Point;
+       Dummy_Context  : Draw_Context)
+-      return Abstract_Item is (Self);
++      return Abstract_Item is (Abstract_Item (Self));
+    overriding function Position
+      (Self : not null access Canvas_Item_Record) return Gtkada.Style.Point;
+    overriding function Contains
+@@ -2027,7 +2027,7 @@ package Gtkada.Canvas_View is
+      (Self           : not null access Canvas_Link_Record;
+       Dummy_At_Point : Model_Point;
+       Dummy_Context  : Draw_Context)
+-      return Abstract_Item is (Self);
++      return Abstract_Item is (Abstract_Item (Self));
+    overriding function Parent
+      (Self : not null access Canvas_Link_Record)
+       return Abstract_Item is (null);
diff --git a/dev-ada/gtkada/gtkada-25.0.1-r2.ebuild b/dev-ada/gtkada/gtkada-25.0.1-r2.ebuild
index c3666df610b4..07f4a4aca329 100644
--- a/dev-ada/gtkada/gtkada-25.0.1-r2.ebuild
+++ b/dev-ada/gtkada/gtkada-25.0.1-r2.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-ADA_COMPAT=( gcc_{12..15} )
+ADA_COMPAT=( gcc_{12..16} )
 inherit ada autotools multiprocessing
 
 DESCRIPTION="A complete Ada graphical toolkit"
@@ -30,7 +30,10 @@ DEPEND="${RDEPEND}
 
 REQUIRED_USE="${ADA_REQUIRED_USE}"
 
-PATCHES=( "${FILESDIR}"/${PN}-23.0.0-gentoo.patch )
+PATCHES=(
+	"${FILESDIR}"/${PN}-23.0.0-gentoo.patch
+	"${FILESDIR}"/${P}-gcc16.patch
+)
 
 src_prepare() {
 	default