garndt pointed me to https://dxr.mozilla.org/mozilla-central/source/testing/docker/b2g-build/Dockerfile today, which contains installation of gcc 4.7 packages and related tweaks. These are inherited from the old buildbot mock stuff, and should be removed. If some builds are actually using that, they should use the gcc tooltool tarballs instead.
I think this is fixed now.
Status: NEW → RESOLVED
Last Resolved: 10 months ago
Resolution: --- → FIXED
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