diff --git a/math/sundials/Makefile b/math/sundials/Makefile
index ee3c9035cff1..3b9ea304c778 100644
--- a/math/sundials/Makefile
+++ b/math/sundials/Makefile
@@ -1,80 +1,80 @@
 PORTNAME=	sundials
 DISTVERSION=	6.4.0
 CATEGORIES=	math
-MASTER_SITES=	https://github.com/LLNL/sundials/archive/v${DISTVERSION}/
+MASTER_SITES=	https://github.com/LLNL/sundials/releases/download/v${DISTVERSION}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	SUite of Nonlinear and DIfferential/ALgebraic Equation Solvers
-WWW=		https://computation.llnl.gov/projects/sundials
+WWW=		https://computing.llnl.gov/projects/sundials
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		cmake:testing fortran localbase:ldflags python:build # 4 tests fail, see https://github.com/LLNL/sundials/issues/220
 USE_LDCONFIG=	yes
 
-CMAKE_ARGS=		-DENABLE_PTHREAD:BOOL=ON \
-			-DBUILD_STATIC_LIBS:BOOL=OFF \
-			-DCMAKE_C_STANDARD=99
-CMAKE_OFF=		EXAMPLES_ENABLE_C EXAMPLES_ENABLE_CXX EXAMPLES_ENABLE_F77 EXAMPLES_ENABLE_F90
+CMAKE_ARGS=		-DCMAKE_C_STANDARD=99
+CMAKE_ON=		ENABLE_PTHREAD
+CMAKE_OFF=		BUILD_STATIC_LIBS \
+			EXAMPLES_ENABLE_C EXAMPLES_ENABLE_CXX EXAMPLES_ENABLE_F77 EXAMPLES_ENABLE_F90
 CMAKE_TESTING_ON=	SUNDIALS_TEST_UNITTESTS \
 			EXAMPLES_ENABLE_C EXAMPLES_ENABLE_CXX EXAMPLES_ENABLE_F77 EXAMPLES_ENABLE_F90
 
-FCFLAGS:=	${FFLAGS} # project checks that these flags are equal
+FCFLAGS:=		${FFLAGS} # project checks that these flags are equal
 
 OPTIONS_DEFINE=		BLAS EXAMPLES KLU LAPACK MPI OPENMP
 OPTIONS_DEFAULT=	KLU LAPACK MPI OPENMP
 OPTIONS_GROUP=		VECTORS
 OPTIONS_GROUP_VECTORS=	HYPRE PETSC
 VECTORS_DESC=		Alternative vector libraries
 OPTIONS_SUB=		yes
 
 BLAS_DESC=		Enable BLAS support
 BLAS_CMAKE_BOOL=	ENABLE_BLAS
 BLAS_USES=		blaslapack:openblas
 
 #EXAMPLES_CMAKE_BOOL=	EXAMPLES_ENABLE_C EXAMPLES_ENABLE_CXX EXAMPLES_ENABLE_F77 EXAMPLES_ENABLE_F90
 #EXAMPLES_CMAKE_ON=	-DEXAMPLES_INSTALL_PATH=${EXAMPLESDIR}
 #PORTEXAMPLES=		*
 
 HYPRE_DESC=		HYPRE vectors support (also enables MPI)
 HYPRE_CMAKE_BOOL=	ENABLE_HYPRE
 HYPRE_CMAKE_ON=		-DHYPRE_INCLUDE_DIR=${LOCALBASE}/include \
 			-DHYPRE_LIBRARY_DIR=${LOCALBASE}/lib
 HYPRE_LIB_DEPENDS=	libHYPRE.so:science/hypre # maybe is broken due to https://github.com/hypre-space/hypre/issues/464
 HYPRE_IMPLIES=		MPI
 HYPRE_PREVENTS=		LAPACK  # error: Incompatible sunindextype for LAPACK; disable LAPACK and rebuild
 HYPRE_BROKEN=		ERROR: SUNDIALS interface to HYPRE is not functional.
 
 KLU_DESC=		Use KLU package that is part of suitesparse
 KLU_CMAKE_BOOL=		ENABLE_KLU
 KLU_CMAKE_ON=		-DKLU_INCLUDE_DIR=${LOCALBASE}/include/suitesparse -DKLU_LIBRARY_DIR=${LOCALBASE}/lib
 KLU_LIB_DEPENDS=	libamd.so:math/suitesparse-amd \
 			libbtf.so:math/suitesparse-btf \
 			libcolamd.so:math/suitesparse-colamd \
 			libklu.so:math/suitesparse-klu \
 			libsuitesparseconfig.so:math/suitesparse-config
 
 LAPACK_DESC=		Use Lapack linear algebra (sets SUNDIALS_INDEX_TYPE=int32)
 LAPACK_USES=		blaslapack:openblas
 LAPACK_CMAKE_BOOL=	ENABLE_LAPACK
 
 MPI_CMAKE_BOOL=		ENABLE_MPI
 MPI_LIB_DEPENDS=	libmpich.so:net/mpich
 
 OPENMP_CMAKE_BOOL=	ENABLE_OPENMP
 
 PETSC_DESC=		PETSc vectors support (also enables MPI)
 PETSC_CMAKE_BOOL=	ENABLE_PETSC
 PETSC_CMAKE_ON=		-DPETSC_DIR=${LOCALBASE} \
 			-DPETSC_INCLUDE_DIR=${LOCALBASE}/include \
 			-DPETSC_LIBRARY_DIR=${LOCALBASE}/lib
 PETSC_LIB_DEPENDS=	libpetsc.so:science/PETSc
 PETSC_IMPLIES=		MPI
 PETSC_PREVENTS=		LAPACK  # error: Incompatible sunindextype for LAPACK; disable LAPACK and rebuild
 PETSC_BROKEN=		ERROR: PETSc not functional due to index size mismatch: SUNDIALS_INDEX_SIZE=64, but PETSc was built with 32-bit indices
 
 post-install:
 	@${RM} ${STAGEDIR}${PREFIX}/include/sundials/LICENSE
 
 .include <bsd.port.mk>
diff --git a/math/sundials/distinfo b/math/sundials/distinfo
index 56a049971741..b0cc1f57effc 100644
--- a/math/sundials/distinfo
+++ b/math/sundials/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1666460608
-SHA256 (sundials-6.4.0.tar.gz) = 3cbf0102c3284dc550a9faf85ace030ca6d02fe70e90afa2d0d8074a098a3948
-SIZE (sundials-6.4.0.tar.gz) = 30316317
+TIMESTAMP = 1666629841
+SHA256 (sundials-6.4.0.tar.gz) = 0aff803a12c6d298d05b56839197dd09858631864017e255ed89e28b49b652f1
+SIZE (sundials-6.4.0.tar.gz) = 89259428