installing scipy in cygwin

[Charles Russell]

With pip install scipy I get error:
  ../scipy/meson.build:163:9: ERROR: Dependency "OpenBLAS" not found

I found this issue discussed in
https://github.com/scipy/scipy/issues/20491 and
https://docs.scipy.org/doc/scipy/building/blas_lapack.html

However, the suggested fix:
python -m pip -Csetup-args=-Dblas=blas -Csetup-args=-Dlapack=lapack
returns "no such option: -C"

What is the current procedure for installing scipy?