Index: head/science/cdo/Makefile
===================================================================
--- head/science/cdo/Makefile	(revision 394667)
+++ head/science/cdo/Makefile	(revision 394668)
@@ -1,84 +1,76 @@
 # Created by: Sunpoet Po-Chuan Hsieh <sunpoet@sunpoet.net>
 # $FreeBSD$
 
 PORTNAME=	cdo
 PORTVERSION=	1.6.9
 PORTREVISION=	1
 CATEGORIES=	science
 MASTER_SITES=	https://code.zmaw.de/attachments/download/10198/ \
 		LOCAL/sunpoet
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Climate Data Operators
 
 LICENSE=	GPLv2
 
 OPTIONS_DEFINE=	CGRIBEX HDF5 JASPER NETCDF PROJ SZIP UDUNITS
 OPTIONS_DEFAULT=CGRIBEX HDF5 JASPER NETCDF PROJ SZIP UDUNITS
 OPTIONS_SUB=	yes
+HDF5_IMPLIES=	SZIP
+NETCDF_IMPLIES=	HDF5
 
 PORTSCOUT=	site:https://code.zmaw.de/projects/cdo/files
 
 CONFIGURE_ARGS=	--disable-cgribex \
 		--disable-data \
 		--disable-extra \
 		--disable-grib \
 		--disable-ieg \
 		--disable-service \
 		--enable-cdi-lib \
 		--program-transform-name="" \
 		--with-zlib=/usr
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 USE_LDCONFIG=	yes
 USES=		gmake libtool pathfix
 
 CGRIBEX_CONFIGURE_OFF=	--without-cgribex
 CGRIBEX_CONFIGURE_ON=	--with-cgribex=${LOCALBASE}
 CGRIBEX_LIB_DEPENDS=	libcgribex.so:${PORTSDIR}/science/cgribex
 HDF5_CONFIGURE_OFF=	--without-hdf5
 HDF5_CONFIGURE_ON=	--with-hdf5=${LOCALBASE}
 HDF5_LIB_DEPENDS=	libhdf5.so:${PORTSDIR}/science/hdf5
 JASPER_CONFIGURE_OFF=	--without-jasper
 JASPER_CONFIGURE_ON=	--with-jasper=${LOCALBASE}
 JASPER_LIB_DEPENDS=	libjasper.so:${PORTSDIR}/graphics/jasper
 NETCDF_CONFIGURE_OFF=	--without-netcdf
 NETCDF_CONFIGURE_ON=	--with-netcdf=${LOCALBASE}
 NETCDF_LIB_DEPENDS=	libnetcdf.so:${PORTSDIR}/science/netcdf
 PROJ_CONFIGURE_OFF=	--without-proj
 PROJ_CONFIGURE_ON=	--with-proj=${LOCALBASE}
 PROJ_LIB_DEPENDS=	libproj.so:${PORTSDIR}/graphics/proj
 SZIP_CONFIGURE_OFF=	--without-szlib
 SZIP_CONFIGURE_ON=	--with-szlib=${LOCALBASE}
 SZIP_LIB_DEPENDS=	libsz.so:${PORTSDIR}/science/szip
 UDUNITS_CONFIGURE_OFF=	--without-udunits2
 UDUNITS_CONFIGURE_ON=	--with-udunits2=${LOCALBASE}
 UDUNITS_LIB_DEPENDS=	libudunits2.so:${PORTSDIR}/science/udunits
-
-.include <bsd.port.options.mk>
-
-.if ${PORT_OPTIONS:MHDF5} && !${PORT_OPTIONS:MSZIP}
-IGNORE=		HDF5 option requires SZIP option
-.endif
-
-.if ${PORT_OPTIONS:MNETCDF} && !${PORT_OPTIONS:MHDF5}
-IGNORE=		NETCDF option requires HDF5 option
-.endif
 
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} != "sparc64"
 CFLAGS+=	-DPTHREAD_MUTEXATTR_CONDATTR
 .endif
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|$$(libdir)/\($$$$pkgconfigfile\)|${PREFIX}/libdata/\1|' ${WRKSRC}/libcdi/src/Makefile.in
 	@${REINPLACE_CMD} -e 's|unsigned32 |uint32_t |' ${WRKSRC}/libcdi/src/cdilib.c ${WRKSRC}/libcdi/src/util.c
 
 regression-test test: build
 .if ${PORT_OPTIONS:MNETCDF}
 	@cd ${WRKSRC}/ && ${SETENV} CDO_PATH=src/cdo src/cdotest
 .endif
 	cd ${WRKSRC}/ && ${SETENV} ${MAKE_ENV} ${MAKE_CMD} check
 
 .include <bsd.port.post.mk>