[Nix-dev] Re: nix-build error: Use of uninitialized value in concatenation

[Christian Wagner]

Eelco Dolstra wrote:
> The problem is that you are running nix-build inside the Nix store
...
> The real problem however is that you shouldn't edit the Nix expressions in
> the channel, which are strictly read-only...
> So developers should do a checkout of the Nixpkgs tree:

> $ svn co https://svn.cs.uu.nl:12443/repos/trace/nixpkgs/trunk nixpkgs

> and hack on that.  (Or you can grab a Nixpkgs tarball, but a SVN checkout
will
> make it much easier to contribute changes :-)

Thanks, building those additional apps works now. I checked out Nixpkgs from
SVN and made that the default:
     nix-env -I /root/nix/nixpkgs/pkgs/top-level/all-packages.nix
I suppose, that channels cannot be used while doing things this way?

I was surprised, that mc (midnight commander) which built successfully in
NixOS suddenly had an additional dependency on X11 when trying to buid in Nix
on Debian. I thought, that it is impossible to have undeclared dependencies
in Nix?

Here is the expression which built successfully on NixOS-0.1pre8658:

{stdenv, fetchurl, pkgconfig, glib, ncurses, libX11}:

stdenv.mkDerivation {
  name = "mc-4.6.1";
  src = fetchurl {
    url =
http://www.ibiblio.org/pub/Linux/utils/file/managers/mc/mc-4.6.1.tar.gz;
    md5 = "18b20db6e40480a53bac2870c56fc3c4";
  };
  buildInputs = [pkgconfig glib ncurses];
  configureFlags = "--with-screen=ncurses";
}

When building with Nix on Debian Etch I had to add X11 as an additional
dependency:

buildInputs = [pkgconfig glib ncurses libX11];

How is this possible?





 
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