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@Brendan: Seeing “No such module ‘PackageDescription’” which I believe is caused by toolchain mismatch. I’m using the latest public Xcode 26, 26.0.1, are there any known workarounds for this?
@Ashley_Mills: Per @Marek_Fořt’s message, I managed to resolve this issue:
After installing Xcode 26, I’d also installed the latest command line tools. Even after selecting Xcode 16.4, xcodebuild was using the toolchain that came with the CLT, rather than those bundled with Xcode itself.
The fix was to run sudo rm -rf /Library/Developer/CommandLineTools to remove the command line tools.