How to set SDK folder that work with setup_sdk() since root became hard read only?
On newer macOS versions root became more protected and you cannot create the /Developer folder to put other SDKs in its subfolder. For providing snapshots I usually stick to the 10.14 SDK and set a lower deployment target. For jhbuildrc I have not found to use setup_sdk(target="10.10", "10.14", architectures=[_default_arch]) and have it find the SDK in any other folder than /Developer/SDKs (I have them in /opt/SDKs).