gnuradio 3.8 on macos

Hi,

I am trying to move to gnuradio 3.8 using macports, but I fail:
- gnuradio installs 3.7.something
- gnuradio-devel dos not install
- gnuradio-next installs 3.9, which conflicts when apps look for 3.8

What I want to achieve: gnuradio3.8 + gr-osmosdr….any suggestions?
Should I use something else than macports?

Thanks for your help!
kai