graphics/rigsofrods-caelum: Fix build with llvm16

- Pet portclippy

Approved by:	portmgr (blanket)
Sponsored by:	The FreeBSD Foundation

graphics/rigsofrods-caelum/Makefile

@@ -13,15 +13,16 @@ LICENSE_FILE=	${WRKSRC}/lgpl.txt
 
 LIB_DEPENDS=	libOgreMain.so:graphics/ogre3d19
 
+USES=		cmake dos2unix pathfix pkgconfig
+DOS2UNIX_GLOB=	CMake* *.pc.in
+USE_CXXSTD=	c++14
 USE_GITHUB=	yes
 GH_ACCOUNT=	RigsOfRods
 GH_PROJECT=	ogre-caelum
-
-USES=		cmake dos2unix pathfix pkgconfig
-CMAKE_ARGS=	-DCaelum_BUILD_SAMPLES=FALSE
-DOS2UNIX_GLOB=	CMake* *.pc.in
 USE_LDCONFIG=	yes
 
+CMAKE_ARGS=	-DCaelum_BUILD_SAMPLES=FALSE
+
 post-patch:
 	@${REINPLACE_CMD} -e '/install.*DOC_FILES/d' \
 		${WRKSRC}/CMakeLists.txt