diff --git a/science/clhep/Makefile b/science/clhep/Makefile
index 66cde9dbea58..d89d59da2f0f 100644
--- a/science/clhep/Makefile
+++ b/science/clhep/Makefile
@@ -6,7 +6,7 @@
 #
 
 PORTNAME=	clhep
-PORTVERSION=	2.0.4.2
+PORTVERSION=	2.0.4.3
 CATEGORIES=	science
 MASTER_SITES=	http://wwwasd.web.cern.ch/wwwasd/lhc++/clhep/DISTRIBUTION/distributions/
 EXTRACT_SUFX=	.tgz
@@ -25,8 +25,14 @@ USE_LDCONFIG=	yes
 
 PLIST_SUB=	VERSION="${PORTVERSION}"
 
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} < 700000
+BROKEN=	Does not compile on FreeBSD 6.X
+.endif
+
 post-patch:
 	@${FIND} ${WRKSRC} -name "configure" | ${XARGS} ${REINPLACE_CMD} -e \
 		 '/AM_CXXFLAGS=/s|-O ||g'
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
diff --git a/science/clhep/distinfo b/science/clhep/distinfo
index c90c7876f763..f81fc8704fa8 100644
--- a/science/clhep/distinfo
+++ b/science/clhep/distinfo
@@ -1,3 +1,3 @@
-MD5 (clhep-2.0.4.2.tgz) = 236a31fe77198d60e07ce7e9b45ade80
-SHA256 (clhep-2.0.4.2.tgz) = 76878719ac91b1dc4cae2f811b1e483916ca06699d18574a9a78b83a19688ea8
-SIZE (clhep-2.0.4.2.tgz) = 3577381
+MD5 (clhep-2.0.4.3.tgz) = 73c124ae72f3c79d9d0851b41283dcf5
+SHA256 (clhep-2.0.4.3.tgz) = 1c247ad06baa26cd4bc55bf5ecd649fcf1d775188e64a8129025ea6b3baad74d
+SIZE (clhep-2.0.4.3.tgz) = 3590896