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Add a news entry for macOS SDK directory change #2684

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Add a news entry for macOS SDK directory change
mgorny Dec 4, 2025
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mgorny Dec 5, 2025
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15 changes: 15 additions & 0 deletions news/2025-12-04-osx-sdk-dir.md
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# macOS SDK directory changed

Starting with conda-smithy 3.53.4, the build scripts will no longer use
the system macOS SDK directory by default. The CI systems will use a
dedicated `/opt/conda-sdks` directory, while users performing local
builds will need to choose a writable directory, and provide the path to
it via `OSX_SDK_DIR` environment variable.

This change may result in some build systems, particularly CMake,
storing paths to this temporary build directory in installed metadata.
Feedstocks will need to substitute the stored paths with path-agnostic
solutions (for example, see [substitutions in
openpmd-api-feedstock](https://github.com/conda-forge/openpmd-api-feedstock/blob/15f9b3648f087d3e06331d6ec9ddff0710300593/recipe/build.sh#L100-L107))
or the correct sysroot paths (for example, see [substitutions in
cartographer-feedstock](https://github.com/conda-forge/cartographer-feedstock/blame/1812f8c13bccbad20daf6ba079f7722cace93a15/recipe/conda_build_config.yaml#L19-L23).
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