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Writing the same build instructions for each systems is a bit tedious, fortunately you can use [flake-utils](https://github.com/numtide/flake-utils) to automate all of that.
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{
description = "My own hello world";
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = import nixpkgs { inherit system; };
in
rec {
packages.hello = pkgs.stdenv.mkDerivation {
name = "hello";
src = self;
buildInputs = [ pkgs.gcc ];
buildPhase = "gcc -o hello ./hello.c";
installPhase = "mkdir -p $out/bin; install -t $out/bin hello";
};
defaultPackage = packages.hello;
}
);
}
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