Index: Mk/bsd.default-versions.mk
===================================================================
--- Mk/bsd.default-versions.mk	(revision 552706)
+++ Mk/bsd.default-versions.mk	(working copy)
@@ -51,7 +51,7 @@
 .if ${ARCH} == "powerpcspe"
 GCC_DEFAULT?=		8
 .else
-GCC_DEFAULT?=		9
+GCC_DEFAULT?=		10
 .endif
 # Possible values: 7, 8, 9, agpl
 GHOSTSCRIPT_DEFAULT?=	agpl
Index: biology/molden/Makefile
===================================================================
--- biology/molden/Makefile	(revision 552706)
+++ biology/molden/Makefile	(working copy)
@@ -39,6 +39,13 @@
 OPTIONS_DEFINE=		DATA DOCS
 OPTIONS_DEFAULT=	DATA
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch between actual argument at (1) and actual argument at (2) (REAL(8)/REAL(4)).
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e \
 		's|^CC |#CC | ; \
Index: cad/calculix-ccx/Makefile
===================================================================
--- cad/calculix-ccx/Makefile	(revision 552706)
+++ cad/calculix-ccx/Makefile	(working copy)
@@ -55,6 +55,11 @@
 FFLAGS+=	-fpic
 .endif
 
+.if ${GCC_DEFAULT} >= 10
+# workaround for Missing actual argument for argument '_formal_15' at (1)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 pre-build:
 	@${REINPLACE_CMD} -e 's+%%FC%%+${FC}+g ; s+%%CC%%+${CC}+g ; \
 	s+%%BLAS_LIBS%%+${BLASLIB}+ ; \
Index: comms/wsjtx/Makefile
===================================================================
--- comms/wsjtx/Makefile	(revision 552706)
+++ comms/wsjtx/Makefile	(working copy)
@@ -36,6 +36,13 @@
 
 _PATCHES=	wsjtx.patch hamlib.patch
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for More actual than formal arguments in procedure call at (1)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-patch:
 .  for _patch in ${_PATCHES}
 	# Keep a copy of the blank patch for the post-build target below
Index: math/blacs/Makefile
===================================================================
--- math/blacs/Makefile	(revision 552706)
+++ math/blacs/Makefile	(working copy)
@@ -35,6 +35,11 @@
 .include <bsd.port.pre.mk>
 
 F77EXTRAFLAGS=	#-w -fno-globals -fugly-complex
+.if ${GCC_DEFAULT} >= 10
+# workaround for Rank mismatch between actual argument at (1) and actual argument at (2) (scalar and rank-1)
+F77EXTRAFLAGS+=	-fallow-argument-mismatch
+.endif
+
 DEBUG_LEVEL=	0
 
 .if ${ARCH} == "sparc64" || ${ARCH} == "amd64"
Index: math/dbcsr/Makefile
===================================================================
--- math/dbcsr/Makefile	(revision 552706)
+++ math/dbcsr/Makefile	(working copy)
@@ -39,6 +39,12 @@
 C_API_DESC=		Build the C API library
 C_API_CMAKE_BOOL=	WITH_C_API
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Error: Rank mismatch between actual argument at (1) and actual argument at (2) (scalar and rank-1)
+.endif
+
 do-test: # tests are broken: https://github.com/cp2k/dbcsr/issues/150
 	@cd ${BUILD_WRKSRC} && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} ${CMAKE_ARGS} -DBUILD_TESTING:BOOL=ON ${CMAKE_SOURCE_PATH} && \
Index: math/gotoblas/Makefile
===================================================================
--- math/gotoblas/Makefile	(revision 552706)
+++ math/gotoblas/Makefile	(working copy)
@@ -78,6 +78,10 @@
 GOTOFLAGS+=	USE_OPENMP=1
 .endif
 
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Type mismatch between actual argument at (1) and actual argument at (2) (REAL(8)/INTEGER(4)).
+.endif
+
 #.if ${PORT_OPTIONS:MQUAD_PRECISION}
 #BROKEN=	WITH_QUAD_PRECISION is broken; please disable this option
 #GOTOFLAGS+=	QUAD_PRECISION=1
Index: math/ipopt/Makefile
===================================================================
--- math/ipopt/Makefile	(revision 552706)
+++ math/ipopt/Makefile	(working copy)
@@ -41,6 +41,13 @@
 
 PORTDOCS=		*
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Rank mismatch between actual argument at (1) and actual argument at (2) (scalar and rank-1)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-extract:
 	@(${ECHO} "Extracting Metis and Mumps ThirdParty libraries ..." )
 	@(cd ${WRKSRC}/ThirdParty/Metis && ${EXTRACT_CMD} ${EXTRACT_BEFORE_ARGS} ${DISTDIR}/metis-4.0.3.tar.gz ${EXTRACT_AFTER_ARGS});
Index: math/mumps/Makefile
===================================================================
--- math/mumps/Makefile	(revision 552706)
+++ math/mumps/Makefile	(working copy)
@@ -44,6 +44,11 @@
 .include <bsd.port.pre.mk>
 .include "${.CURDIR}/../../french/aster/bsd.aster.mk"
 
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch in argument 's' at (1); passed INTEGER(4) to LOGICAL(4)
+FCFLAGS+=	-fallow-argument-mismatch
+.endif
+
 .ifdef WITH_MPI
 PKGNAMESUFFIX+=		-mpich
 .endif
Index: math/scalapack/Makefile
===================================================================
--- math/scalapack/Makefile	(revision 552706)
+++ math/scalapack/Makefile	(working copy)
@@ -75,6 +75,11 @@
 FFLAGS+=	${FPIC}
 SVERSION=	2
 
+.if ${GCC_DEFAULT} >= 10
+# workaround for Rank mismatch between actual argument at (1) and actual argument at (2) (scalar and rank-1)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 .if defined(WITH_OPTIMIZED_FLAGS)
 .if ${ARCH} == "amd64"
 FFLAGS+=	-pipe -O3 -ffast-math -funroll-all-loops -fpeel-loops -ftracer -funswitch-loops -funit-at-a-time
Index: math/scilab/Makefile
===================================================================
--- math/scilab/Makefile	(revision 552706)
+++ math/scilab/Makefile	(working copy)
@@ -130,6 +130,13 @@
 CONFIGURE_ARGS+=	--enable-debug
 .endif
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Rank mismatch between actual argument at (1) and actual argument at (2) (rank-1 and scalar)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} 's,/usr/local,${LOCALBASE},' ${WRKSRC}/etc/librarypath.xml
 	@${REINPLACE_CMD} -e 's, gfortran, ${FC},' ${WRKSRC}/modules/dynamic_link/src/scripts/configure
Index: math/sdpa/Makefile
===================================================================
--- math/sdpa/Makefile	(revision 552706)
+++ math/sdpa/Makefile	(working copy)
@@ -40,6 +40,13 @@
 
 MANUALFILE=		sdpa.7.1.1.manual.20080618.pdf
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch in argument 's' at (1); passed INTEGER(4) to LOGICAL(4)
+CONFIGURE_ARGS+=	FCFLAGS=-fallow-argument-mismatch
+.endif
+
 post-extract:
 	@(cd ${DISTDIR}/${DIST_SUBDIR} && ${PAX} -rw \
 		mumps_4.10.0.dfsg.orig.tar.gz ${WRKSRC}/mumps)
@@ -62,4 +69,4 @@
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${DISTDIR}/${DIST_SUBDIR}/${MANUALFILE} ${STAGEDIR}${DOCSDIR}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: science/cp2k/Makefile
===================================================================
--- science/cp2k/Makefile	(revision 552706)
+++ science/cp2k/Makefile	(working copy)
@@ -66,6 +66,10 @@
 	fi
 .endif
 
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Element of assumed-shape or pointer array as actual argument at (1) cannot correspond to actual argument at (2)
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -i '' 's|LIBS.*=.*|& ${LDFLAGS}|; s|^FCFLAGS.*=.*|& -I${LOCALBASE}/include|; s| -march=native||' ${WRKSRC}/arch/FreeBSD-*
 
Index: science/dalton/Makefile
===================================================================
--- science/dalton/Makefile	(revision 552706)
+++ science/dalton/Makefile	(working copy)
@@ -29,6 +29,12 @@
 
 BINARY_ALIAS=	python=${PYTHON_CMD}
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Type mismatch between actual argument at (1) and actual argument at (2) (REAL(8)/INTEGER(4)).
+.endif
+
 post-install:
 	@${MV} ${STAGEDIR}${PREFIX}/${PORTNAME} ${STAGEDIR}${DATADIR}
 	@${REINPLACE_CMD} -i '' 's|%%SCRIPT_DIR%%|${DATADIR}|; s|%%PREFIX%%|${PREFIX}|' ${STAGEDIR}${DATADIR}/${PORTNAME}
@@ -35,4 +41,4 @@
 	@${MV} ${STAGEDIR}${DATADIR}/${PORTNAME}* ${STAGEDIR}${PREFIX}/bin/
 	@cd ${STAGEDIR}${DATADIR} && ${RM} -r tools/CMakeFiles tools/Makefile tools/cmake_install.cmake
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: science/dlpoly-classic/Makefile
===================================================================
--- science/dlpoly-classic/Makefile	(revision 552706)
+++ science/dlpoly-classic/Makefile	(working copy)
@@ -36,6 +36,12 @@
 GUI_PLIST_FILES=	bin/dlpoly-gui \
 			${DATADIR_REL}/GUI.jar
 
+.include <bsd.port.options.mk>
+
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(4)/REAL(4)).
+.endif
+
 post-patch:
 	${CP} ${WRKSRC}/build/MakePAR ${WRKSRC}/build/MakeSEQ ${BUILD_WRKSRC}
 	${REINPLACE_CMD} 's|gfortran|${FC}|g' ${BUILD_WRKSRC}/MakeSEQ
@@ -54,8 +60,6 @@
 		${CP} -f MakePAR Makefile && \
 		${MAKE} gfortran)
 
-.include <bsd.port.options.mk>
-
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/execute/dlpoly-classic ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_PROGRAM} ${WRKSRC}/execute/dlpoly-classic-mpi ${STAGEDIR}${PREFIX}/bin
Index: science/getdp/Makefile
===================================================================
--- science/getdp/Makefile	(revision 552706)
+++ science/getdp/Makefile	(working copy)
@@ -18,6 +18,13 @@
 
 USES=		fortran tar:tgz cmake
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Rank mismatch in argument 'lines' at (1) (rank-1 and scalar)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
 do-test:
Index: science/latte/Makefile
===================================================================
--- science/latte/Makefile	(revision 552706)
+++ science/latte/Makefile	(working copy)
@@ -40,4 +40,11 @@
 
 CONFLICTS_INSTALL=	latte-integrale
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch between actual argument at (1) and actual argument at (2) (COMPLEX(8)/REAL(8)).
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 .include <bsd.port.mk>
Index: science/libgridxc/Makefile
===================================================================
--- science/libgridxc/Makefile	(revision 552706)
+++ science/libgridxc/Makefile	(working copy)
@@ -37,6 +37,12 @@
 LIBXC_LIB_DEPENDS=	libxc.so:science/libxc
 LIBXC_BROKEN=		Fails to build with libxc-5.0.0: https://bugs.launchpad.net/libgridxc/+bug/1899578
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+BROKEN=		fails to build with GCC 10: Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(8)/INTEGER(4)).
+.endif
+
 post-patch:
 	@${MKDIR} ${BUILD_WRKSRC}
 	@${CAT} ${WRKSRC}/../extra/fortran.mk \
Index: science/mdynamix/Makefile
===================================================================
--- science/mdynamix/Makefile	(revision 552706)
+++ science/mdynamix/Makefile	(working copy)
@@ -26,4 +26,11 @@
 	${INSTALL_PROGRAM} ${WRKSRC}/md ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_PROGRAM} ${WRKSRC}/mdp ${STAGEDIR}${PREFIX}/bin
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(4)/REAL(4)).
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 .include <bsd.port.mk>
Index: science/pnetcdf/Makefile
===================================================================
--- science/pnetcdf/Makefile	(revision 552706)
+++ science/pnetcdf/Makefile	(working copy)
@@ -37,6 +37,13 @@
 OPENMPI3_CONFIGURE_ON=	--with-mpi=${LOCALBASE}/mpi/openmpi3
 OPENMPI3_LIB_DEPENDS=	libmpi.so:net/openmpi3
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(8)/CHARACTER(*)).
+FCFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e '/$$(INSTALL.*$$(PREFIX)/ s|$$(PREFIX)|$$(DESTDIR)&|' ${WRKSRC}/Makefile.in
 
Index: science/quantum-espresso/Makefile
===================================================================
--- science/quantum-espresso/Makefile	(revision 552706)
+++ science/quantum-espresso/Makefile	(working copy)
@@ -34,6 +34,14 @@
 
 MAKE_JOBS_UNSAFE=	yes # https://github.com/QEF/q-e/issues/9
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Error: Rank mismatch between actual argument at (1)
+#   and actual argument at (2) (scalar and rank-1)
+FFLAGS+=	-fallow-argument-mismatch
+.endif
+
 post-extract:
 	@${RM} ${WRKSRC}/archive/lapack-3.6.1.tgz
 	@cd ${WRKSRC} && ${MKDIR} FoX && ${LN} -s ${LOCALBASE}/include FoX/finclude
Index: science/siesta/Makefile
===================================================================
--- science/siesta/Makefile	(revision 552706)
+++ science/siesta/Makefile	(working copy)
@@ -26,6 +26,13 @@
 
 PLIST_FILES=	bin/${PORTNAME}
 
+.include <bsd.port.pre.mk>
+
+.if ${GCC_DEFAULT} >= 10
+# workaround for Type mismatch between actual argument at (1) and actual argument at (2) (COMPLEX(8)/REAL(8)).
+FCFLAGS+=	-fallow-argument-mismatch
+.endif
+
 pre-configure:
 	@cd ${WRKSRC} && ${SETENV} ${MAKE_ENV} ${SH} ../Src/obj_setup.sh
 
@@ -32,4 +39,4 @@
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>