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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Can't compile Mac","articleBody":"### Bug summary\n\nWhen trying to build on a Mac (15.6.1), I get:\n\n```\n../../subprojects/freetype-2.6.1/src/gzip/infcodes.c:71:17: error: use of undeclared identifier 'Byte'\n     71 |     c-\u003edbits = (Byte)bd;\n        |                 ^\n```\n\nThis is in a micro mamba environment, made with `environment.yml`.\n\nMatplotlib seems to run in dev mode, but I need to recompile to get pytest to work.  \n\n### Code for reproduction\n\n```Python\n`python -m pip install --verbose --no-build-isolation --editable \".[dev]\"`\n```\n\n### Actual outcome\n\n```\n  In file included from ../../subprojects/freetype-2.6.1/src/gzip/ftgzip.c:65:\n  In file included from ../../subprojects/freetype-2.6.1/src/gzip/zlib.h:34:\n  ../../subprojects/freetype-2.6.1/src/gzip/zconf.h:228:12: error: unknown type name 'Byte'\n    228 |    typedef Byte  FAR Bytef;\n        |            ^\n  In file included from ../../subprojects/freetype-2.6.1/src/gzip/ftgzip.c:83:\n  ../../subprojects/freetype-2.6.1/src/gzip/inftrees.h:22:7: error: unknown type name 'Byte'\n     22 |       Byte Exop;        /* number of extra bits or operation */\n        |       ^\n  ```\n...etc\n\n### Expected outcome\n\ndev install\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nMacOS 15.6.1\n\n### Matplotlib Version\n\nmain\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nconda","author":{"url":"https://github.com/jklymak","@type":"Person","name":"jklymak"},"datePublished":"2025-08-28T16:56:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/30480/matplotlib/issues/30480"}