Cross Compiling

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For building arm software check out the Article NixOS on ARM
If you are looking for building 32bit software, check out Packaging/32bit Applications
Quick example to cross compile a package: Cheatsheet#Cross-compile_packages.

Cross-Compiling in nixpkgs unstable (pre-18.09)

A lot has happened in 2018 and now cross-compilation is well supported within the ubstable branch of nixpkgs. The basic idea is to use pkgsCross.platform instead of pkgs:

nix build -f channel:nixos-unstable pkgsCross.raspberryPi.emacs

References

• Nixpkgs manual on cross compiling
• Introduction to Cross Compilation with nix by Matthew Bauer