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 unstable 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