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# Installing Simgrid from the stable channel.
nix-env -iA nixpkgs.simgrid
# And installing it from unstable, this will override the current simgrid.
nix-env -iA unstable.simgrid
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# to install nix onto any linux system:
sh <(curl -L https://nixos.org/nix/install) --daemon
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nix-env -i package_name