Lluís Batlle i Rossell d170c98d13 Making nixos keep a ref to its stdenv
This will help a lot on ARM, where nix-collect-garbage erases gcc; then, any
change to a small system config file requires rebuilding gcc again.

I don't know why it does not happen on x86. Maybe it just pulls the gcc from
hydra, if garbage is collected.
2015-05-09 20:19:34 +00:00
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