diff --git a/math/lambda/Makefile b/math/lambda/Makefile
index 778828c471bb..7ac7b91769b1 100644
--- a/math/lambda/Makefile
+++ b/math/lambda/Makefile
@@ -1,43 +1,46 @@
 PORTNAME=	lambda
-PORTVERSION=	0.1.4
-PORTREVISION=	2
+DISTVERSION=	0.1.4
+PORTREVISION=	3
 CATEGORIES=	math
 MASTER_SITES=	http://uniquesoftwaredesigns.com/${PORTNAME}/
 
 MAINTAINER=	bofh@FreeBSD.org
 COMMENT=	Lambda calculus interpreter
 WWW=		https://uniquesoftwaredesigns.com/lambda/docs/lambda.html
 
 LICENSE=	GPLv2
 
+DEPRECATED=		Upstream unmaintained since 2004
+EXPIRATION_DATE=	2026-09-30
+
 USES=		perl5 ncurses readline shebangfix
 USE_CXXSTD=	c++14
 USE_PERL5=	build
 
 SHEBANG_FILES=	docs/trans_xml_for_cat.pl
 
 GNU_CONFIGURE=	yes
 
 PLIST_FILES=	bin/lambda \
 		share/lambda/definitions \
 		share/lambda/definitions_with_numbers
 
 DOCS=		lambda.html lambdamanual.html user_manual_style.css
 PORTDOCS=	*
 
 OPTIONS_DEFINE=	DOCS
 
 post-patch:
 	${REINPLACE_CMD} -e 's|-ltermcap|-lncurses|' ${WRKSRC}/configure \
 		${WRKSRC}/Makefile.in ${WRKSRC}/Makefile.am
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/lambda ${STAGEDIR}${PREFIX}/bin
 	@${MKDIR} ${STAGEDIR}${DATADIR}
 	${INSTALL_DATA} ${WRKSRC}/definitions* ${STAGEDIR}${DATADIR}
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 .for file in ${DOCS}
 	${INSTALL_DATA} ${WRKSRC}/docs/${file} ${STAGEDIR}${DOCSDIR}
 .endfor
 
 .include <bsd.port.mk>