Index: head/net/librdkafka/Makefile
===================================================================
--- head/net/librdkafka/Makefile	(revision 393438)
+++ head/net/librdkafka/Makefile	(revision 393439)
@@ -1,32 +1,38 @@
 # Created by: Victor Yagofarov <xnasx@yandex.ru>
 # $FreeBSD$
 
 PORTNAME=	librdkafka
 PORTVERSION=	0.8.6
 CATEGORIES=	net
 DISTNAME=	${GH_ACCOUNT}-${PORTNAME}-${PORTVERSION}-${GH_TAGNAME}
 
 MAINTAINER=	xnasx@yandex.ru
 COMMENT=	Apache Kafka C/C++ library
 
 LICENSE=	BSD3CLAUSE
 
 BUILD_DEPENDS=	bash:${PORTSDIR}/shells/bash
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	edenhill
 GH_TAGNAME=	e3d984849a
 
 USE_LDCONFIG=	yes
 
 USES=	gmake perl5
 GNU_CONFIGURE=	yes
 
+.include <bsd.port.pre.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1000000 && ${ARCH} == "i386"
+CFLAGS+=	-march=pentium
+.endif
+
 post-install:
 	${INSTALL_DATA} ${WRKSRC}/rdkafka.pc  ${STAGEDIR}${PREFIX}/libdata/pkgconfig/librdkafka.pc
 
 post-stage:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/librdkafka.so.1
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/librdkafka++.so.1
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>