AC_ARG_WITH(rsb, AC_HELP_STRING([--with-rsb], [Specify Recursive Sparse BLAS library linkage (or the output of librsb-config)]), [if test x$withval = xno; then
AC_ARG_WITH(rsb, AC_HELP_STRING([--with-rsb], [Specify Recursive Sparse BLAS library linkage (or the output of librsb-config --static --ldflags)]), [if test x$withval = xno; then
want_rsb_libs= ; else if test x$withval = xyes ; then want_rsb_libs=-lrsb ; else want_rsb_libs="$withval" ; fi ; FDEFINES="$psblas_cv_define_prepend-DHAVE_LIBRSB $FDEFINES" ; fi], [want_rsb_libs=""])