diff --git a/science/aircraft-datcom/Makefile b/science/aircraft-datcom/Makefile
index 9557dada4757..f46e6e3e255f 100644
--- a/science/aircraft-datcom/Makefile
+++ b/science/aircraft-datcom/Makefile
@@ -1,25 +1,28 @@
 PORTNAME=	aircraft-datcom
 DISTVERSION=	0.0.20120723
-PORTREVISION=	6
+PORTREVISION=	7
 CATEGORIES=	science
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Modified USAF Aircraft Stability and Control Data Compendium
 WWW=		https://www.pdas.com/datcom.html
 
 LICENSE=	GPLv3
 
+DEPRECATED=	Ancient software, does not build with CMake 4
+EXPIRATION_DATE=2026-11-30
+
 USE_GITHUB=	yes
 GH_ACCOUNT=	arktools
 GH_TAGNAME=	ed877bb
 
 USES=	fortran cmake
 FFLAGS+=	-std=legacy
 
 OPTIONS_DEFINE=	DOCS
 
 post-install-DOCS-on:
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/doc/* ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>