diff --git a/math/arpack/Makefile b/math/arpack/Makefile
index 7bb2f11bff4..a2066fa1dfe 100644
--- a/math/arpack/Makefile
+++ b/math/arpack/Makefile
@@ -1,10 +1,10 @@
-# $OpenBSD: Makefile,v 1.16 2017/11/13 07:09:06 steven Exp $
+# $OpenBSD: Makefile,v 1.17 2018/10/23 20:35:47 steven Exp $
 
 COMMENT=	solve large scale eigenvalue problems
 
 DISTNAME=	arpack96
 PKGNAME=	arpack-96
-REVISION=	5
+REVISION=	6
 SHARED_LIBS=	arpack 1.0
 CATEGORIES=	math
 
@@ -23,14 +23,15 @@ BUILD_DEPENDS=		${MODFORTRAN_BUILD_DEPENDS}
 
 LIB_DEPENDS =	math/lapack \
 		math/blas
-WANTLIB =	lapack>=1 blas>=1
+WANTLIB =	lapack>=1 blas>=1 m
 
 WRKDIST=	${WRKDIR}/ARPACK
 WRKSRC=		${WRKDIST}/SRC
 MAKE_FILE=	${FILESDIR}/Makefile
 MAKE_ENV=	SHLIB_MAJOR=${LIBarpack_VERSION:R} \
 		SHLIB_MINOR=${LIBarpack_VERSION:E} \
-		FC="${MODFORTRAN_COMPILER} -cpp"
+		FC="${MODFORTRAN_COMPILER} -cpp" \
+		CC=${MODFORTRAN_COMPILER}
 FAKE_FLAGS=	LIBDIR=${LOCALBASE}/lib DEBUGLIBS=no
 
 post-extract:
diff --git a/math/blas/Makefile b/math/blas/Makefile
index 12139b9bc03..0ce55b722b9 100644
--- a/math/blas/Makefile
+++ b/math/blas/Makefile
@@ -1,9 +1,10 @@
-# $OpenBSD: Makefile,v 1.27 2017/11/13 06:56:38 steven Exp $
+# $OpenBSD: Makefile,v 1.28 2018/10/23 20:35:47 steven Exp $
 
 COMMENT=	Basic Linear Algebra Subprograms
 
 VERSION=	3.7.1
 DISTNAME=	blas-${VERSION}
+REVISION=	0
 
 SHARED_LIBS=	blas	2.1
 
@@ -26,11 +27,13 @@ WRKDIST=	${WRKDIR}/${DISTNAME:U}
 MODULES=	fortran
 MODFORTRAN_COMPILER = gfortran
 BUILD_DEPENDS=	${MODFORTRAN_BUILD_DEPENDS}
+WANTLIB=	m
 
 MAKE_FILE=	${FILESDIR}/Makefile
 MAKE_ENV=	SHLIB_MAJOR=${LIBblas_VERSION:R} \
 		SHLIB_MINOR=${LIBblas_VERSION:E} \
-		FC="${MODFORTRAN_COMPILER} -cpp"
+		FC="${MODFORTRAN_COMPILER} -cpp" \
+		CC=${MODFORTRAN_COMPILER}
 FAKE_FLAGS=	LIBDIR=${LOCALBASE}/lib DEBUGLIBS=no
 USE_GROFF=	Yes
 
diff --git a/math/lapack/Makefile b/math/lapack/Makefile
index df744f49535..d97071ae37f 100644
--- a/math/lapack/Makefile
+++ b/math/lapack/Makefile
@@ -1,9 +1,10 @@
-# $OpenBSD: Makefile,v 1.26 2017/11/13 06:57:36 steven Exp $
+# $OpenBSD: Makefile,v 1.27 2018/10/23 20:35:47 steven Exp $
 
 COMMENT=	library of Fortran linear algebra subroutines
 
 VERSION=	3.7.1
 DISTNAME=	lapack-${VERSION}
+REVISION=	0
 
 SHARED_LIBS=	lapack 6.0
 
@@ -24,7 +25,7 @@ EXTRACT_SUFX=	.tgz
 DIST_SUBDIR=	${DISTNAME}
 
 LIB_DEPENDS =	math/blas
-WANTLIB =	blas>=1
+WANTLIB =	blas>=1 m
 
 MODULES=	fortran
 MODFORTRAN_COMPILER = gfortran
@@ -33,7 +34,8 @@ BUILD_DEPENDS=	${MODFORTRAN_BUILD_DEPENDS}
 MAKE_ENV=	SHLIB_MAJOR=${LIBlapack_VERSION:R} \
 		SHLIB_MINOR=${LIBlapack_VERSION:E} \
 		TIMER=EXT_ETIME \
-		FC="${MODFORTRAN_COMPILER} -cpp"
+		FC="${MODFORTRAN_COMPILER} -cpp" \
+		CC=${MODFORTRAN_COMPILER}
 FAKE_FLAGS=	LIBDIR=${LOCALBASE}/lib DEBUGLIBS=no
 USE_GROFF =	Yes