diff -ruN hdf5.orig/Makefile hdf5/Makefile
--- hdf5.orig/Makefile	2009-09-15 16:21:56.000000000 +0200
+++ hdf5/Makefile	2009-11-21 00:00:58.000000000 +0100
@@ -18,6 +18,8 @@
 MAINTAINER=	koziol@hdfgroup.org
 COMMENT=	Hierarchical Data Format library (from NCSA)
 
+CONFLICTS=	hdf5-1.8.*
+
 USE_LDCONFIG=	yes
 USE_AUTOTOOLS=	libtool:22
 GNU_CONFIGURE=	yes