diff --git a/net/appkonference/Makefile b/net/appkonference/Makefile
index 9d036755311d..d14c56d04afa 100644
--- a/net/appkonference/Makefile
+++ b/net/appkonference/Makefile
@@ -1,44 +1,47 @@
 # Created by: Alex Deiter <Alex.Deiter@Gmail.COM>
 
 PORTNAME=	appkonference
 PORTVERSION=	2.8
 PORTREVISION=	3
 CATEGORIES=	net
 MASTER_SITES=	SF
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	High-performance Asterisk voice/video conferencing plugin
 
+DEPRECATED=	Outdated, depends on unsupported version of net/asterisk
+EXPIRATION_DATE=2021-12-31
+
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BROKEN=		does not build with net/asterisk1{6,8}
 
 ONLY_FOR_ARCHS=		amd64 armv6 armv7 i386 powerpc powerpc64 powerpc64le
 ONLY_FOR_ARCHS_REASON=	not yet ported to this architecture
 
 USES=		compiler:features gmake
 USE_CSTD=	gnu89
 WRKSRC=		${WRKDIR}/${PORTNAME}/konference
 MAKE_ARGS=	ASTERISK_SRC_VERSION=1300
 # Fix build with clang11
 CFLAGS+=	-fcommon
 
 PLIST_FILES=	lib/asterisk/modules/app_konference.so
 
 OPTIONS_DEFINE=		OPTIMIZED_CFLAGS
 OPTIONS_DEFAULT=	OPTIMIZED_CFLAGS
 
 OPTIMIZED_CFLAGS_CFLAGS=	-O3 -ffast-math
 
 .include <bsd.port.pre.mk>
 
 .if ${PORT_OPTIONS:MOPTIMIZED_CFLAGS} && ${CHOSEN_COMPILER_TYPE} == gcc
 CFLAGS+=	-funroll-all-loops -fsingle-precision-constant
 .endif
 
 .if ${CHOSEN_COMPILER_TYPE} == clang
 CFLAGS+=        -fblocks
 .endif
 
 .include <bsd.port.post.mk>