diff --git a/science/pnetcdf/Makefile b/science/pnetcdf/Makefile
index 9990f1995913..bfa494405188 100644
--- a/science/pnetcdf/Makefile
+++ b/science/pnetcdf/Makefile
@@ -1,44 +1,49 @@
 PORTNAME=	pnetcdf
 PORTVERSION=	1.12.3
 CATEGORIES=	science parallel
 MASTER_SITES=	https://parallel-netcdf.github.io/Release/ \
 		LOCAL/sunpoet
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Library providing high-performance I/O
 
 USES=		fortran gmake libtool pathfix perl5
 USE_PERL5=	build
 
 CFLAGS+=	-fPIC
 CONFIGURE_ARGS=	--with-mpi=${MPI_HOME} ac_cv_fc_compiler_nag=no
 GNU_CONFIGURE=	yes
 MAKE_JOBS_UNSAFE=	yes
 
 CONFLICTS_INSTALL=	hdf-4.*
 
 OPTIONS_SINGLE=	MPI
 OPTIONS_SINGLE_MPI=	OPENMPI MPICH
-OPTIONS_DEFAULT=${OPTIONS_DEFAULT_${ARCH}}
-OPTIONS_DEFAULT_amd64=	OPENMPI
+OPTIONS_DEFAULT=	OPENMPI
+OPTIONS_DEFAULT_armv6=	MPICH
+OPTIONS_DEFAULT_armv7=	MPICH
 OPTIONS_DEFAULT_i386=	MPICH
-#OPTIONS_DEFAULT=OPENMPI
+OPTIONS_DEFAULT_powerpc=	MPICH
+OPTIONS_EXCLUDE_armv6=	OPENMPI
+OPTIONS_EXCLUDE_armv7=	OPENMPI
+OPTIONS_EXCLUDE_i386=	OPENMPI
+OPTIONS_EXCLUDE_powerpc=	OPENMPI
 
 MPICH_USES=	mpi:mpich
 OPENMPI_USES=	mpi:openmpi
 
 .include <bsd.port.pre.mk>
 
 .if ${GCC_DEFAULT} >= 10
 # workaround for Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(8)/CHARACTER(*)).
 FCFLAGS+=	-fallow-argument-mismatch
 .endif
 
-.if ${ARCH} == i386 && ${PORT_OPTIONS:MOPENMPI}
+.if (${ARCH} == armv6 || ${ARCH} == armv7 || ${ARCH} == i386 || ${ARCH} == powerpc) && ${PORT_OPTIONS:MOPENMPI}
 BROKEN=		Use MPICH option instead. PnetCDF requires MPI_Offset >= 8 but Open MPI sets MPI_Offset to 4 on 32-bit architecture regardless of LFS. See https://github.com/open-mpi/ompi/issues/3195 for details
 .endif
 
 post-patch:
 	@${REINPLACE_CMD} -e '/$$(INSTALL.*$$(PREFIX)/ s|$$(PREFIX)|$$(DESTDIR)&|' ${WRKSRC}/Makefile.in
 
 .include <bsd.port.post.mk>