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https://github.com/NixOS/nixpkgs/blob/master/pkgs/shells/bash/default.nix
    -DDEFAULT_PATH_VALUE="/no-such-path"

bash source:
  /* Now make our own defaults in case the vars that we think are
     important are missing. */
  temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);

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{ pkgs, ... }:

{
  services.udev.extraRules = ''
    SUBSYSTEM!="sound", GOTO="pulseaudio_end"
    ACTION!="change", GOTO="pulseaudio_end"
    KERNEL!="card*", GOTO="pulseaudio_end"

    SUBSYSTEMS=="pci", RESULT=="?*", ATTRS{vendor}=="0x1002", ATTRS{device}=="0x4383", ENV{PULSE_PROFILE_SET}="formula-z.conf"

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{ config, pkgs, ...}:

let
  pixfix = if (builtins.currentSystem == "armv6l-linux") then
    [ ./pixman.nix ]
  else
    [];
  passwords = import ./passwords.nix;
  keys = import ./keys.nix;
in

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{
  packageOverrides = pkgs: rec {
    qemu-user-arm = pkgs.callPackage ./qemu-user.nix { user_arch = "arm"; };
    qemu-user-arm64 = pkgs.callPackage ./qemu-user.nix { user_arch = "aarch64"; };
    nix = pkgs.stdenv.lib.overrideDerivation pkgs.nix (oldAttrs: {
      patches = ./hax.patch;
    });
  };
}

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{ ... }:
{
  fileSystems = {
    "/" = {
      device = "UUID=d230cc98-8f33-457f-9fee-b65558165188";
      fsType = "ext4";
      iscsi = {
        enable = true;
        host = "192.168.2.61";
        lun = "iqn.2001-04.com.c2d-nix3";

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{ ... }:

{
  imports = [ ./tgt_service.nix ];
  services = {
    atftpd.enable = true;
    atftpd.root = "/tftproot";
    tgtd = {
      enable = true;
      targets = {

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{ config, pkgs, ... }:

{
  imports = [ ./default.nix /root/nixcfg/core.nix ];
  services = {
    example = {
      enable = true;
    };
  };
  environment.systemPackages = with pkgs; [ wget tcpdump ltrace gdb ];

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diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index d9b009d..16348fb 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -55,6 +55,10 @@ bool BasicDerivation::isBuiltin() const

 bool BasicDerivation::canBuildLocally() const
 {
+    StringSet platforms = tokenizeString<StringSet>(settings.get("build-extra-platforms",string("")));
+

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# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, lib, pkgs, ... }:

let
      local_dwm  = lib.overrideDerivation pkgs.dwm (o: {
        nativeBuildInputs = o.nativeBuildInputs ++ [ pkgs.xorg.libXcursor ];
        patches = [

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let
  ugly = { laptop = ./laptop.nix; desktop = ./desktop.nix; };
in
{
  imports = [ ugly.${config.network.hostName} ];
}