push sheeet

default.nix

@@ -0,0 +1,33 @@
+let
+  missingFeatures = map ({ description, ... }: description) (import ./lib/minfeatures.nix).missing;
+in
+
+if missingFeatures != [ ] then
+
+  abort ''
+
+    This version of Nixpkgs requires an implementation of Nix with the following features:
+    - ${builtins.concatStringsSep "\n- " missingFeatures}
+
+    Your are evaluating with Nix ${builtins.nixVersion or "(too old to know)"}, please upgrade:
+
+    - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.
+
+    - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
+      upgrade Nix. You may use `nix-env --version' to check which version you have.
+
+    - If you installed Nix using the install script (https://nixos.org/nix/install),
+      it is safe to upgrade by running it again:
+
+          curl -L https://nixos.org/nix/install | sh
+
+    For more information, please see the NixOS release notes at
+    https://nixos.org/nixos/manual or locally at
+    ${toString ./nixos/doc/manual/release-notes}.
+
+    If you need further help, see https://nixos.org/nixos/support.html
+  ''
+
+else
+
+  import ./pkgs/top-level/impure.nix