diff --git a/games/acm/Makefile b/games/acm/Makefile
index 3e27e392c8c3..39452e223c93 100644
--- a/games/acm/Makefile
+++ b/games/acm/Makefile
@@ -1,31 +1,34 @@
 PORTNAME=	acm
 PORTVERSION=	5.0
 PORTREVISION=	3
 CATEGORIES=	games
 MASTER_SITES=	http://mirror.amdmi3.ru/distfiles/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Aerial combat simulator for X11
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+DEPRECATED=	Abandoned upstream. Does not work.
+EXPIRATION_DATE=	2023-03-31
+
 USES=		perl5 xorg
 USE_PERL5=	build
 USE_XORG=	x11 xext
 HAS_CONFIGURE=	yes
 CONFIGURE_ARGS=	--prefix=${PREFIX} --x-includes=${LOCALBASE}/include \
 		--x-libraries=${LOCALBASE}/lib
 CONFIGURE_ENV=	ac_cv_lib_Xm_XmCreateBulletinBoard=no \
 		ac_cv_lib_gdbm_dbm_fetch=no
 MAKE_ARGS=	prefix=${STAGEDIR}${PREFIX}/ OBVDIR=${STAGEDIR}${DATADIR}/
 
 # Fix build with clang11
 CFLAGS+=	-fcommon
 
 OPTIONS_DEFINE=	SOUND
 
 SOUND_LIB_DEPENDS=	libaudio.so:audio/nas
 SOUND_CONFIGURE_ENV_OFF=	ac_cv_lib_audio_AuCloseServer=no
 
 .include <bsd.port.mk>