@GrB/private/gbmxm.m

function C = gbmxm (Cin, M, accum, semiring, A, B, desc)     %#ok

% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2021, All Rights Reserved.
% SPDX-License-Identifier: GPL-3.0-or-later

error ('GrB:mex', 'mexFunction not found; use gbmake to compile GraphBLAS') ;