[Nix-dev] Assertion failed crossSystem == null

[Rahul Muttineni]

I am on commit b2f426d9816ae1b0dfc8e6cd2e8dd23d9326182f and the following
error is occuring.

$ nix-shell -f /path/to/nixpkgs
error: assertion failed at
/home/rahulmutt/src/nixpkgs/pkgs/top-level/all-packages.nix:4971:15

Tracing, I find that it corresponds to binutilsCross expression and the
assertion fails at crossSystem != null. I am running ubuntu 14.04. How do I
resolve this error?
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