undefined reference to `matmul_mkl_f64_'

Hi everybody,

I receive an error when trying to compile with the Fortran Compiler of Intel® Parallel Studio XE 2018.

I use the following flags for compilation: -fast -parallel -qopenmp -qopt-matmul -axCOMMON-AVX512 -ftz -ip -pad -unroll-aggressive

and these for linking: -parallel -qopenmp -lmatmul -qopt-report=5

At the linking stage I keep getting this kind of message:

ipo_out.f:(.text+0x255af): undefined reference to `matmul_mkl_f64_'

I have tried a number of combinations of linking options but the error persists

Any suggestion?

Thanks a lot in advance

Corrado