diff --git a/math/algae/Makefile b/math/algae/Makefile
index 385a737f6ad6..3042e6816d32 100644
--- a/math/algae/Makefile
+++ b/math/algae/Makefile
@@ -1,32 +1,31 @@
 PORTNAME=	algae
 PORTVERSION=	4.3.6
 PORTREVISION=	20
 CATEGORIES=	math
 MASTER_SITES=	SF/${PORTNAME}/${PORTNAME}/${PORTNAME}-${PORTVERSION}
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Programming language for numerical analysis
 WWW=		https://algae.sourceforge.net/
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BROKEN_aarch64=		does not build: checking for proper floating point exception handling... no
 BROKEN_armv6=		does not build: checking for proper floating point exception handling... no
 BROKEN_armv7=		does not build: checking for proper floating point exception handling... no
 
-GNU_CONFIGURE=	yes
-GNU_CONFIGURE_MANPREFIX=${PREFIX}/share
-USES=		fortran
+USES=		fortran:gfortran
 
+GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-dlmalloc --without-fftw --without-blas \
 		--without-lapack --without-bcslib --without-npsol
-FFLAGS+=	-std=legacy
+FFLAGS=		-std=legacy
 PLIST_SUB=	ALGAE_VERSION=${PORTVERSION}
 
 INFO=		${PORTNAME}
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}-${PORTVERSION}
 
 .include <bsd.port.mk>