Index: head/math/visualpolylib/Makefile
===================================================================
--- head/math/visualpolylib/Makefile	(revision 549414)
+++ head/math/visualpolylib/Makefile	(revision 549415)
@@ -1,29 +1,31 @@
 # $FreeBSD$
 
 PORTNAME=	visualpolylib
 DISTVERSION=	0.9
 DISTVERSIONSUFFIX=	e
 CATEGORIES=	math
 MASTER_SITES=	http://icps.u-strasbg.fr/polylib/download/
 DISTNAME=	${PORTNAME}.${DISTVERSION}${DISTVERSIONSUFFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Visualization program for PolyLib
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libfontconfig.so:x11-fonts/fontconfig \
 		libfreetype.so:print/freetype2 \
 		libgmp.so:math/gmp \
 		libpolylibgmp.so:math/polylib
 
 USES=		gettext-runtime gmake gnome pkgconfig
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-static \
 		--with-polylib=${LOCALBASE}/lib/libpolylibgmp.so
 USE_GNOME=	atk cairo gdkpixbuf2 glib20 gtk20 pango
 
+CFLAGS+=	-fcommon # notified the maontainer via e-mail on Sep 19, 2020
+
 PLIST_FILES=	bin/${PORTNAME}
 
 .include <bsd.port.mk>