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Debian 11 bullseye can no longer be built against: its package pool has been pruned while the suite index still advertises the removed versions, so apt resolves a version and then 404s on the download. Both stages were affected, the build stage through imgproxy-base v3.14.0 and the final image directly. The whole 3.x line of imgproxy-base is bullseye, so there is no smaller bump that escapes it. v4.1.5 is built on Ubuntu 22.04, which carries support years further out than a Debian oldstable would. The final image keeps Python 3.11 for the dither plugin's compiled extension but moves to bookworm, which also brings the distro python3 to 3.11; on bullseye it was 3.9, a version apart from the interpreter the plugin installs against. Its newer setuptools shadows the stdlib distutils with a vendored copy that dropped msvccompiler, which numpy.distutils needs to build the Fortran extension, so that install asks for the stdlib one. Dither output is unchanged: the same palette and image render pixel-identically to the previous stack, for both the drive-value output and the soft proof. Assisted by Claude Opus 5
jnross
added this pull request to stack #66
September 17, 2026 01:01
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While attempting to build imgproxy with the 9-color dithering changes, I encountered many errors like this:
bullseyeis old and, it appears, no longer supported. With Claude's help I updated to a newer version ofimgproxy-baseandpython:3.11-slim-bookworm.We'll need to do some testing to make sure this introduces no regressions in image rendering. If there are other approaches to minimize the risk here while building
imgproxy, please let me know.