diff --git a/graphics/R-cran-s2/Makefile b/graphics/R-cran-s2/Makefile
index bb315a614431..1e8df715fd5f 100644
--- a/graphics/R-cran-s2/Makefile
+++ b/graphics/R-cran-s2/Makefile
@@ -1,21 +1,27 @@
 PORTNAME=	s2
 PORTVERSION=	1.0.6
 CATEGORIES=	graphics
 DISTNAME=	${PORTNAME}_${PORTVERSION}
 
 MAINTAINER=	tota@FreeBSD.org
 COMMENT=	Spherical Geometry Operators Using the S2 Geometry Library
 
 LICENSE=	APACHE20
 
 NOT_FOR_ARCHS=	armv6 armv7 i386 mips powerpc powerpcspe
 NOT_FOR_ARCHS_REASON=	is currently 64-bit only
 
 CRAN_DEPENDS=	R-cran-Rcpp>0:devel/R-cran-Rcpp \
 		R-cran-wk>0:math/R-cran-wk
 BUILD_DEPENDS=	${CRAN_DEPENDS}
 RUN_DEPENDS=	${CRAN_DEPENDS}
 
 USES=		cran:auto-plist,compiles
 
+.include <bsd.port.options.mk>
+
+.if ${ARCH} == powerpc64
+EXTRA_PATCHES=	${FILESDIR}/extra-patch-src_Makevars.in
+.endif
+
 .include <bsd.port.mk>
diff --git a/graphics/R-cran-s2/files/extra-patch-src_Makevars.in b/graphics/R-cran-s2/files/extra-patch-src_Makevars.in
new file mode 100644
index 000000000000..bfbd3bb57d12
--- /dev/null
+++ b/graphics/R-cran-s2/files/extra-patch-src_Makevars.in
@@ -0,0 +1,10 @@
+--- src/Makevars.in.orig	2021-07-06 12:09:16 UTC
++++ src/Makevars.in
+@@ -1,6 +1,6 @@
+ PKG_CPPFLAGS = -I../inst/include -DSTRICT_R_HEADERS
+ PKG_LIBS = @libs@
+-PKG_CXXFLAGS = @cflags@ -pthread
++PKG_CXXFLAGS = @cflags@ -pthread -mcpu=power7
+ CXX_STD = CXX11
+ 
+ OBJECTS = cpp-compat.o \