When running cmake with an existing OpenBLAS with the flag -DWITH_OPENBLAS_LIB=location/of/openblas/lib, the README states that
(...) location/of/openblas/lib is the path to the directory containing the OpenBLAS shared library, usually libopenblas.so.
But cmake throws a warning "requests linking to directory". The flag -DWITH_OPENBLAS_LIB must point to a file and not a directory, that is, in the README, location/of/openblas/lib should read location/of/openblas/lib/libopenblas.so. By doing that, I could successfully compile and run strata on OpenSUSE Leap 15.3.