Index: Makefile
===================================================================
--- Makefile
+++ Makefile
@@ -30,12 +30,17 @@
 LDFLAGS+=	-shared
 
 OPTIONS_DEFINE=	ATLAS DOCS SUITESPARSE
-OPTIONS_DEFAULT=SUITESPARSE
+OPTIONS_SINGLE=	BLASLIB
+OPTIONS_SINGLE_BLASLIB=	ATLAS BLAS OPENBLAS
+OPTIONS_DEFAULT=BLAS SUITESPARSE
 ATLAS_DESC=	Use optimized blas library
+BLAS_DESC=	Use blas+lapack libraries
+OPENBLAS_DESC=	Use openblas library
 SUITESPARSE_DESC=	Use AMD and UMFPACK in SuiteSparse
 
 ATLAS_USES=	blaslapack:atlas
-ATLAS_USES_OFF=	blaslapack:netlib
+BLAS_USES=	blaslapack:netlib
+OPENBLAS_USES=	blaslapack:openblas
 SUITESPARSE_LIB_DEPENDS=	libumfpack.so:${PORTSDIR}/math/suitesparse
 SUITESPARSE_BUILD_DEPENDS=	swig:${PORTSDIR}/devel/swig13