diff --git a/emulators/cannonball/Makefile b/emulators/cannonball/Makefile
index 2cb69b21f970..f61e28e43be8 100644
--- a/emulators/cannonball/Makefile
+++ b/emulators/cannonball/Makefile
@@ -1,45 +1,45 @@
 PORTNAME=	cannonball
 DISTVERSION=	0.34
 DISTVERSIONPREFIX=v
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	emulators games
 
 MAINTAINER=	fox@FreeBSD.org
 COMMENT=	Enhanced OutRun Engine
 WWW=		https://github.com/djyt/cannonball/wiki
 
 LICENSE=	MAME-LICENSE
 LICENSE_NAME=	MAME license
 LICENSE_FILE=	${WRKSRC}/docs/license.txt
 LICENSE_PERMS=	dist-mirror no-dist-sell pkg-mirror no-pkg-sell auto-accept
 
 BUILD_DEPENDS=	${LOCALBASE}/include/boost/exception/all.hpp:devel/boost-libs
 
 USES=		cmake:insource gl pkgconfig sdl
 USE_SDL=	sdl2
 USE_GL=		gl glu
 
 CMAKE_ARGS+=	${WRKSRC}/cmake \
 		-DTARGET=linux.cmake
 
 CFLAGS+=	-I${LOCALBASE}/include
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	djyt
 
 BUILD_WRKSRC=		${WRKSRC}/cmake
 CONFIGURE_WRKSRC=	${WRKSRC}/cmake
 
 SUB_FILES=	${PORTNAME}.sh
 
 do-install:
 	${MKDIR} ${STAGEDIR}${DATADIR}/res
 	${MKDIR} ${STAGEDIR}${DATADIR}/conf
 	${INSTALL_DATA} ${WRKSRC}/cmake/res/tilemap.bin ${STAGEDIR}${DATADIR}/res/tilemap.bin
 	${INSTALL_DATA} ${WRKSRC}/cmake/res/tilepatch.bin ${STAGEDIR}${DATADIR}/res/tilepatch.bin
 	${INSTALL_DATA} ${WRKSRC}/cmake/config.xml ${STAGEDIR}${DATADIR}/conf/config.xml
 	${INSTALL_MAN} ${WRKSRC}/docs/cannonball.6 ${STAGEDIR}${PREFIX}/share/man/man6
 	${INSTALL_SCRIPT} ${WRKDIR}/${PORTNAME}.sh ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 	${INSTALL_PROGRAM} ${WRKSRC}/cmake/cannonball ${STAGEDIR}${PREFIX}/libexec
 
 .include <bsd.port.mk>
diff --git a/emulators/cannonball/files/patch-cmake_CMakeLists.txt b/emulators/cannonball/files/patch-cmake_CMakeLists.txt
new file mode 100644
index 000000000000..6e43be87ad5a
--- /dev/null
+++ b/emulators/cannonball/files/patch-cmake_CMakeLists.txt
@@ -0,0 +1,13 @@
+Add compatibility for CMake 4.
+
+--- cmake/CMakeLists.txt.orig	2026-08-25 20:05:26 UTC
++++ cmake/CMakeLists.txt
+@@ -5,7 +5,7 @@
+ # Everything should go into a win64.cmake equivalent.
+ # -----------------------------------------------------------------------------
+ 
+-cmake_minimum_required (VERSION 3.3.2) # Might compile lower, but untested
++cmake_minimum_required (VERSION 3.5.2) # Might compile lower, but untested
+ project (cannonball)
+ 
+ # -----------------------------------------------------------------------------