MacPorts and /opt/local on Catalina and Big Sur read only volumes

Tabitha McNerney tabithamc at
Fri Jun 25 23:07:42 UTC 2021

Hi all,

I haven't installed a fresh MacPorts system in quite some time but will
soon be doing so on a few Macs one running Catalina and the other Big Sur.
Starting with Catalina, the root volume / is read-only so how do the
MacPorts package installers set things up such that /opt/local can remain
the default path to MacPorts for both read and write functionality on
Catalina and Big Sur? Do the MacPorts package installers make use of
Apple's new bi-directional firmlinks capability defined in
/etc/synthetic.conf as also described on this page?

Thank you.

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