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+## Background
+
+Much in the same vain as my [nix-shell (note to self)][nix-shell-note], I'm
+going to leave a note to my future self on how to install packages using
+`nix-env`, which is something I do once in a blue moon.
+
+## Solution
+
+```shell
+λ nix-env -iA tvix.eval -f /depot
+```
+
+Looks like I was forgetting the `-f /depot` option all this time:
+
+> --file / -f path
+>     Specifies the Nix expression (designated below as the active Nix
+>     expression) used by the --install, --upgrade, and --query --available
+>     operations to obtain derivations. The default is ~/.nix-defexpr.
+> - `man nix-env`
+
+## Failed Attempts (don't try these at home)
+
+This section is brought to you by my shell's `Ctrl-r`!
+
+```shell
+λ nix-env -I depot=/depot -iA depot.tvix.eval
+λ NIX_PATH=depot=/depot nix-env -iA depot.tvix.eval
+λ nix-env -iE '(import /depot {}).tvix.eval'
+```
+
+Thanks for reading!
+
+[nix-shell-note]: https://billandhiscomputer.com/blog/posts/nix-shell.html