gistfile1.txt

Usage: nix why-depends <FLAGS>... <PACKAGE> <DEPENDENCY>

Summary: show why a package has another package in its closure.

Flags:
  -a, --all                     show all edges in the dependency graph leading from 'package' to 'dependency', rather than just a shortest path
      --arg <NAME> <EXPR>       argument to be passed to Nix functions
      --argstr <NAME> <STRING>  string-valued argument to be passed to Nix functions
  -f, --file <FILE>             evaluate FILE rather than the default
  -I, --include <PATH>          add a path to the list of locations used to look up <...> file names

Examples:

  To show one path through the dependency graph leading from Hello to Glibc:
  $ nix why-depends nixpkgs.hello nixpkgs.glibc

  To show all files and paths in the dependency graph leading from Thunderbird to libX11:
  $ nix why-depends --all nixpkgs.thunderbird nixpkgs.xorg.libX11

  To show why Glibc depends on itself:
  $ nix why-depends nixpkgs.glibc nixpkgs.glibc

Note: this program is EXPERIMENTAL and subject to change.