diff --git a/math/pynac/Makefile b/math/pynac/Makefile
index 603fcb000be5..2598d89957f4 100644
--- a/math/pynac/Makefile
+++ b/math/pynac/Makefile
@@ -1,36 +1,39 @@
 PORTNAME=	pynac
 PORTVERSION=	0.7.29
 PORTREVISION=	1
 CATEGORIES=	math python
 MASTER_SITES=	https://github.com/${PORTNAME}/${PORTNAME}/archive/
 
 MAINTAINER=	thierry@FreeBSD.org
 COMMENT=	Symbolic computation with Python objects, Sage Math support library
 WWW=		http://pynac.org/
 
 LICENSE=	GPLv2
 
+DEPRECATED=	Project merged with SageMath
+EXPIRATION_DATE=2022-12-31
+
 LIB_DEPENDS=	libgmp.so:math/gmp		\
 		libntl.so:math/ntl		\
 		libmpfr.so:math/mpfr		\
 		libflint.so:math/flint2		\
 		libSingular.so:math/singular
 
 USES=		autoreconf compiler:c++11-lang libtool localbase pkgconfig	\
 		python:3.6+
 
 OPTIONS_DEFINE=		GIAC
 OPTIONS_DEFAULT=
 GIAC_DESC=		Use giac for polynomial manipulations
 GIAC_LIB_DEPENDS=	libgiac.so:math/giacxcas
 GIAC_CONFIGURE_ON=	--with-giac
 GIAC_CONFIGURE_OFF=	--without-giac
 GIAC_LIBS=		"-lm"
 
 GNU_CONFIGURE=	yes
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTNAME}-${PORTVERSION}
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip
 TEST_TARGET=	check
 
 .include <bsd.port.mk>