This works fine on pixi 0.62.2 on Linux x64:
[workspace]
channels = ["conda-forge"]
platforms = ["linux-64", "osx-arm64"]
preview = ["pixi-build"]
[dependencies]
python = "*"
numpy.git = "https://github.com/numpy/numpy"
numpy.subdirectory = "pixi-packages/default"
After upgrading to pixi 0.63.0 and wiping (pixi clean && pixi clean cache -y), I get
Error: × failed to build 'numpy' from 'https://github.com/numpy/numpy@23cb680c9ca4695799ed373ab47624dc6b409fb6 (subdir: pixi-packages/
│ default)'
╰─▶ × No license files were copied