diff --git a/science/pastix/Makefile b/science/pastix/Makefile
index 077bc8f85718..2b1935197e7c 100644
--- a/science/pastix/Makefile
+++ b/science/pastix/Makefile
@@ -1,49 +1,50 @@
 PORTNAME=	pastix
 PORTVERSION=	6.3.0
 CATEGORIES=	science
 MASTER_SITES=	https://gitlab.inria.fr/solverstack/pastix/uploads/${GL_TAG}/
 
 MAINTAINER=	thierry@FreeBSD.org
 COMMENT=	PaStiX: a sparse direct solver
 WWW=		https://solverstack.gitlabpages.inria.fr/pastix/
 
 LICENSE=	LGPL3
 
 BUILD_DEPENDS=	bash:shells/bash	\
 		${PYNUMPY}
 LIB_DEPENDS=	libcblas.so:math/cblas	\
 		libmetis.so:math/metis	\
 		libscotch.so:cad/scotch	\
 		liblapacke.so:math/lapacke	\
 		libhwloc.so:devel/hwloc2
 RUN_DEPENDS=	bash:shells/bash	\
 		${PYNUMPY}
 
 USES=		cmake blaslapack:openblas fortran pkgconfig python
 
 #USE_GITLAB=	yes
 #GL_SITE=	https://gitlab.inria.fr/
 #GL_ACCOUNT=	solverstack
 #GL_PROJECT=	pastix spm:s morse_cmake:m
 #GL_TAGNAME=	6e35c2ba179013b058f5d4e1afd4b451953149c6	\
 #		14e36c1586c9ba13f938b1a89f51c080d6551392:s	\
 #		31cd2bbb0d76f2b9fd83011d8f079d97540b0ba8:m
 #GL_SUBDIR=	spm:s cmake_modules/morse_cmake:m
 GL_TAG=		87c0b910dce3d81667e760c720e706d1	# tarball with submodules
 
+LDFLAGS+=	-lm
 CMAKE_ARGS=	-DBUILD_SHARED_LIBS:BOOL=ON	\
 		-DPASTIX_ORDERING_METIS:BOOL=ON
 USE_LDCONFIG=	yes
 TEST_TARGET=	test
 
 OPTIONS_DEFINE=	EXAMPLES
 EX2FIX=		example spm/examples spm/wrappers/fortran90 spm/wrappers/python	\
 		wrappers/fortran90 wrappers/python example/old
 
 pre-configure:
 .for ex in ${EX2FIX}
 	${REINPLACE_CMD} -e 's|DESTINATION examples|DESTINATION ${EXAMPLESDIR}/${ex:C/examples//:C/example//}|'	\
 		${WRKSRC}/${ex}/CMakeLists.txt
 .endfor
 
 .include <bsd.port.mk>