Index: head/science/aircraft-datcom/Makefile
===================================================================
--- head/science/aircraft-datcom/Makefile	(revision 541191)
+++ head/science/aircraft-datcom/Makefile	(revision 541192)
@@ -1,25 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	aircraft-datcom
 DISTVERSION=	0.0.20120723
 PORTREVISION=	5
 CATEGORIES=	science
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Modified USAF Aircraft Stability and Control Data Compendium
 
 LICENSE=	GPLv3
 
 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>