3 files changed, 56 insertions, 1 deletions
diff --git a/dev-lang/mono/files/mono-6.12.0.199-boringssl-cmake4.patch b/dev-lang/mono/files/mono-6.12.0.199-boringssl-cmake4.patch
new file mode 100644
index 000000000000..ea9c4c86fce3
--- /dev/null
+++ b/dev-lang/mono/files/mono-6.12.0.199-boringssl-cmake4.patch
@@ -0,0 +1,22 @@
+From 2153da68cbe3a3afe5416b4373edc7a64146da13 Mon Sep 17 00:00:00 2001
+From: Esme Povirk <esme@codeweavers.com>
+Date: Fri, 11 Apr 2025 18:01:12 +0000
+Subject: [PATCH] CMakeLists: Fix build on cmake 4.0.
+
+---
+ external/boringssl/CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/external/boringssl/CMakeLists.txt b/external/boringssl/CMakeLists.txt
+index eaa59401d..6d8b06e15 100644
+--- a/external/boringssl/CMakeLists.txt
++++ b/external/boringssl/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required (VERSION 2.8.10)
++cmake_minimum_required (VERSION 2.8.10...4.0)
+ 
+ # Defer enabling C and CXX languages.
+ project (BoringSSL NONE)
+-- 
+GitLab
+
diff --git a/dev-lang/mono/files/mono-6.12.0.199-cmake4.patch b/dev-lang/mono/files/mono-6.12.0.199-cmake4.patch
new file mode 100644
index 000000000000..ef39f8090811
--- /dev/null
+++ b/dev-lang/mono/files/mono-6.12.0.199-cmake4.patch
@@ -0,0 +1,32 @@
+From 831415edd2a578a2b4851996ca796f47dbc3f2f3 Mon Sep 17 00:00:00 2001
+From: Esme Povirk <esme@codeweavers.com>
+Date: Fri, 11 Apr 2025 18:08:04 +0000
+Subject: [PATCH] btls: Fix build on cmake 4.x.
+
+---
+ mono/btls/CMakeLists.txt | 9 +--------
+ 1 files changed, 1 insertions(+), 8 deletions(-)
+
+diff --git a/mono/btls/CMakeLists.txt b/mono/btls/CMakeLists.txt
+index 992f41e4c7f..dbad836fc27 100644
+--- a/mono/btls/CMakeLists.txt
++++ b/mono/btls/CMakeLists.txt
+@@ -1,14 +1,7 @@
+-cmake_minimum_required (VERSION 2.8.10)
++cmake_minimum_required (VERSION 2.8.10...4.0)
+ 
+ project (mono-btls)
+ 
+-if(POLICY CMP0026)
+-	cmake_policy(SET CMP0026 NEW)
+-endif()
+-if(POLICY CMP0042)
+-	cmake_policy(SET CMP0042 NEW)
+-endif()
+-
+ enable_language(C)
+ enable_language(CXX)
+ 
+-- 
+GitLab
+
diff --git a/dev-lang/mono/mono-6.12.0.199-r2.ebuild b/dev-lang/mono/mono-6.12.0.199-r2.ebuild
index 0e9e15766cb6..9325e610a8a1 100644
--- a/dev-lang/mono/mono-6.12.0.199-r2.ebuild
+++ b/dev-lang/mono/mono-6.12.0.199-r2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -40,6 +40,7 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-5.12-try-catch.patch
 	"${FILESDIR}"/${PN}-6.12.0.122-disable-automagic-ccache.patch
 	"${FILESDIR}"/${PN}-6.12.0.199-configure-c99.patch
+	"${FILESDIR}"/${PN}-6.12.0.199-{,boringssl-}cmake4.patch # bug 957434, fixed in git main branch
 )
 
 pkg_pretend() {