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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).