diff --git a/games/dxx-rebirth/Makefile b/games/dxx-rebirth/Makefile
index 2998713ea9c2..dfc6bb839161 100644
--- a/games/dxx-rebirth/Makefile
+++ b/games/dxx-rebirth/Makefile
@@ -1,48 +1,52 @@
 PORTNAME=	dxx-rebirth
 PORTVERSION=	20220929
 DISTVERSIONSUFFIX=	-src
 PORTREVISION=	1
 CATEGORIES=	games
 MASTER_SITES=	https://www.dxx-rebirth.com/download/dxx/rebirth/
 DISTNAME=	${PORTNAME}_${PORTVERSION}${DISTVERSIONSUFFIX}
 
 PATCH_SITES=	https://github.com/dxx-rebirth/dxx-rebirth/commit/
 PATCHFILES=	fc4157f56f6acd5e63367974dd4249b88f3a2535.patch:-p1 \
 		2dd538eb4d51835ad4c93b96edd374548b0eef67.patch:-p1
 
 MAINTAINER=	pkubaj@FreeBSD.org
 COMMENT=	Open source port of Descent and Descent 2
 WWW=		https://www.dxx-rebirth.com/
 
 LICENSE=	GPLv3 PARALLAX
 LICENSE_COMB=	multi
 LICENSE_NAME_PARALLAX=	original Parallax license
 LICENSE_FILE_GPLv3=	${WRKSRC}/GPL-3.txt
 LICENSE_FILE_PARALLAX=	${WRKSRC}/COPYING.txt
 LICENSE_PERMS_PARALLAX=	dist-mirror pkg-mirror auto-accept
 
 BUILD_DEPENDS=	as:devel/binutils
 LIB_DEPENDS=	libphysfs.so:devel/physfs \
 		libpng.so:graphics/png
 
 USES=		compiler:c++17-lang gl localbase:ldflags pkgconfig scons sdl \
 		tar:xz
 USE_GL=		gl glu
 USE_SDL=	image2 mixer2 sdl2
 
 MAKE_ARGS=	ignore_unknown_variables=1 sdl2=1
 
 PLIST_FILES=	bin/d1x-rebirth \
 		bin/d2x-rebirth
 
 .include <bsd.port.options.mk>
 
 .if ${ARCH} != powerpc64 && ${ARCH} != riscv64
 MAKE_ARGS+=	lto=1
 .endif
 
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+CPPFLAGS+=	-Wno-error=unused-but-set-parameter -Wno-error=unused-but-set-variable
+.endif
+
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/d1x-rebirth \
 		${STAGEDIR}${PREFIX}/bin/d2x-rebirth
 
 .include <bsd.port.mk>