Index: head/math/sleef/Makefile
===================================================================
--- head/math/sleef/Makefile	(revision 518858)
+++ head/math/sleef/Makefile	(revision 518859)
@@ -1,29 +1,31 @@
 # Created by: Johannes M Dieterich <jmd@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	sleef
 DISTVERSION=	3.4.0
 PORTREVISION=	1
 CATEGORIES=	math
 
 MAINTAINER=	jmd@FreeBSD.org
 COMMENT=	SIMD Library for Evaluating Elementary Functions, vectorized libm
 
 LICENSE=	BSL
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 USES=		cmake compiler:c11
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	shibatch
 
+CFLAGS_powerpc64=	-mpower8-vector
+
 .include <bsd.port.options.mk>
 
 .if ${ARCH} == powerpc64
 PLIST_SUB+=	NO_PPC64="@comment "
 .else
 PLIST_SUB+=	NO_PPC64=""
 .endif
 
 .include <bsd.port.mk>