René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error finding \"ninja\" when setting up development environment","articleBody":"Following the instructions in https://matplotlib.org/devdocs/devel/development_setup.html#create-local-environment (but using `uv` to manage the virtual environment), I end up with the following error:\n\n```\n% uv pip install --verbose --no-build-isolation --editable \".[dev]\"\nDEBUG uv 0.6.5 (Homebrew 2025-03-06)\nDEBUG Searching for default Python interpreter in virtual environments\nDEBUG Found `cpython-3.12.8-macos-aarch64-none` at `/Users/dstansby/software/matplotlib/.venv/bin/python3` (active virtual environment)\nDEBUG Using Python 3.12.8 environment at: .venv\nDEBUG Acquired lock for `.venv`\nDEBUG At least one requirement is not satisfied: file:///Users/dstansby/software/matplotlib\nDEBUG Using request timeout of 30s\nDEBUG Found PEP 621 metadata for /Users/dstansby/software/matplotlib in `pyproject.toml` (matplotlib)\nDEBUG No static `pyproject.toml` available for: matplotlib @ file:///Users/dstansby/software/matplotlib (DynamicField(\"version\"))\nDEBUG Acquired lock for `/Users/dstansby/.cache/uv/sdists-v8/editable/a93b495625504936`\nDEBUG Preparing metadata for: matplotlib @ file:///Users/dstansby/software/matplotlib\nDEBUG No workspace root found, using project root\nDEBUG Proceeding without build isolation\nDEBUG Calling `mesonpy.prepare_metadata_for_build_editable()`\n   Building matplotlib @ file:///Users/dstansby/software/matplotlib\nDEBUG Building: matplotlib @ file:///Users/dstansby/software/matplotlib\nDEBUG No workspace root found, using project root\nDEBUG Proceeding without build isolation\nDEBUG Calling `mesonpy.build_editable(\"/Users/dstansby/.cache/uv/builds-v0/.tmp3JxhbI\", {}, None)`\nDEBUG \nDEBUG meson-python: error: Could not find ninja version 1.8.2 or newer.\nDEBUG Released lock at `/Users/dstansby/.cache/uv/sdists-v8/editable/a93b495625504936/.lock`\n  × Failed to build `matplotlib @ file:///Users/dstansby/software/matplotlib`\n  ├─▶ The build backend returned an error\n  ╰─▶ Call to `mesonpy.build_editable` failed (exit status: 1)\n\n      [stdout]\n\n      meson-python: error: Could not find ninja version 1.8.2 or newer.\n\n      hint: This usually indicates a problem with the package or the build\n      environment.\nDEBUG Released lock at `/Users/dstansby/software/matplotlib/.venv/.lock`\n```\n\nAdding `ninja\u003e=1.8.2` to the build requirements file seems to fix this.\n","author":{"url":"https://github.com/dstansby","@type":"Person","name":"dstansby"},"datePublished":"2025-03-12T12:24:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/29739/matplotlib/issues/29739"}