[Nix-dev] error: cannot auto-call a function that has an argument without a default value (‘stdenv’)

[Christian Kauhaus]

Am 07.07.2017 um 08:07 schrieb Vladimír Čunát via nix-dev:
> That's how it's commonly done in nixpkgs.  If you want a *separate*
> expression that depends on nixpkgs, you may e.g. start by adding this
> line to the beginning of the file:
>     with import <nixpkgs> {};
> instead of
>     { stdenv, something1, something2, ... }:

Another solution (at least commonly used here at Flying Circus IO):

* leave the package expr as-is
* call it with the idiom 

  nix-build -E 'with import <nixpkgs> {}; callPackage ./hello.nix {}'


HTH

Christian

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