diff --git a/math/opensolaris-libm/Makefile b/math/opensolaris-libm/Makefile
index 8bb73e87100f..832dcba19b9c 100644
--- a/math/opensolaris-libm/Makefile
+++ b/math/opensolaris-libm/Makefile
@@ -1,40 +1,43 @@
 PORTNAME=	opensolaris-libm
 PORTVERSION=	2006.01.31
 DISTVERSIONPREFIX=	v
 PORTREVISION=	5
 CATEGORIES=	math
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	C99 Math and vector libraries from OpenSolaris snv_33
 WWW=		https://docs.oracle.com/cd/E19422-01/819-3693/ncg_lib.html
 
 LICENSE=	CDDL
 LICENSE_FILE=	${WRKSRC}/usr/src/OPENSOLARIS.LICENSE
 
+DEPRECATED=	Obsolete, consider using libm in base or math/openlibm
+EXPIRATION_DATE=2024-12-31
+
 BROKEN_FreeBSD_14=	fails to compile: conflicting types for 'lround'
 ONLY_FOR_ARCHS=	amd64	# i386 possible with much work
 
 PORTSCOUT=	ignore:1
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	jrmarino
 GH_TAGNAME=	2017.01.31
 
 BUILD_WRKSRC=	${WRKSRC}/usr/src/libm/wos64
 INSTALL_WRKSRC=	${WRKSRC}/usr/src/libm/wos64
 MAKEFILE=	Makefile.bsd
 MAKE_ENV=	ARCH=${ARCH} USE_ASSEMBLY_VERSIONS=yes
 
 .include <bsd.port.options.mk>
 
 .if ${OPSYS} == FreeBSD
 RUN_DEPENDS=	${LOCALBASE}/bin/addr2line:devel/binutils
 
 post-patch:
 	# The addr2line program in FreeBSD is inadequate, so pull in
 	# binutils on FreeBSD
 	@${REINPLACE_CMD} -e 's|/usr/bin|/usr/local/bin|' \
 		${WRKSRC}/usr/src/libm/src/m9x/__traceback.c
 .endif
 
 .include <bsd.port.mk>