Contributing to Nixpkgs

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  • You want to clone NixOS/nixpkgs locally and use tools like nix-build instead of the flake commands
    • They’re faster and easier to customize when changing things
  • Some builds require using --cores to control how parallel they are thanks to the parallel build processes using so much memory.

CUDA Link to heading

You can enable CUDA support by configuring nixpkgs. This command does it for when you’re testing a build in the nixpkgs git repo.

nix-build --arg config '{ allowUnfree = true; cudaSupport = true; cudaCapabilities = [ "8.6" "12.0" ]; cudaForwardCompat = false; }' \
  -A python312Packages.xformers --cores 2 .
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