Build Dependencies

How to add build dependencies for a packages

• Difference between nativeBuildInputs and buildInputs
• Difference between propagated and non-propagated inputs
• Demonstrate some common usage patterns around dependencies

How do packages find dependencies when building?

• They don't, nix attempts to fulfill assumptions made by the toolchain
  • Generally delegated to tooling which specializes in dependency discovery
    • PKG_CONFIG_PATH? for pkg-config
    • CMAKE_MODULE_PATH? for cmake
    • PYTHONPATH for python when using buildPythonPackage
    • etc.

Explain difference between out, dev, lib, and other outputs

• It's a common use case to reference one or more outputs
• Mention the lib's getDev, getDev, getLib, and getMan helpers
• TODO: Link to another section expanding on multi-output derivations