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#8500 switched to zlib-ng in our wheels. However, #8750 has reported that wheels now segfault on macOS 10.13 and 10.14.

zlib-ng/zlib-ng#1877 was created to investigate this, and there is now a proposed fix in zlib-ng/zlib-ng#1878.

However, in case it is not merged and released before Pillow 11.2.0, this PR temporarily reverts to using zlib on macOS < 10.15.

@radarhere radarhere merged commit b1f7ba0 into python-pillow:main Mar 30, 2025
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@radarhere radarhere deleted the zlib_macos branch March 30, 2025 21:48
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radarhere commented Aug 7, 2025

zlib-ng 2.2.5 has been released with the fix, so #9140 has been created to revert this.

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