{ config, pkgs, ... }:

{
  # Enable F-Droid and the F-Droid privileged extension
  apps.fdroid.enable = true;

  device = "hlte";
  flavor = "lineageos";
  androidVersion = 15;

  #source.dirs."device/qcom/sepolicy-legacy".src = builtins.fetchGit {
  #  rev = "d958b58b0d28288e82251a75e53f5c90da559b63";
  #  url = "https://github.com/html6405/android_device_qcom_sepolicy-legacy.git";
  #  allRefs = true;
  #};

  #source.dirs."device/samsung/msm8974-common".src = builtins.fetchGit {
  #  rev = "81196871ba6b3c6cab09d209a7b92585d582b233";
  #  url = "https://github.com/html6405/android_device_samsung_msm8974-common.git";
  #  allRefs = true;
  #};

  #source.dirs."device/samsung/hlte-common".src = builtins.fetchGit {
  #  rev = "5263a01f1a7b405ee081461087ec270267cdeeee";
  #  url = "https://github.com/samsung-hlte/android_device_samsung_hlte-common.git";
  #  allRefs = true;
  #};


  source.dirs."device/samsung/msm8974-common".src =/home/matthew/tmp/android_device_samsung_msm8974-common;
  source.dirs."device/qcom/sepolicy-legacy".src = /home/matthew/tmp/android_device_qcom_sepolicy-legacy;
  source.dirs."device/samsung/hlte-common".src = /home/matthew/tmp/android_device_samsung_hlte-common;
  source.dirs."hardware/samsung".src = /home/matthew/tmp/android_hardware_samsung;

  source.dirs."device/samsung/qcom-common".src = builtins.fetchGit {
    rev = "3f56559a5436fd7be36fc6b7010ed3506ebe6e08";
    url = "https://github.com/LineageOS/android_device_samsung_qcom-common.git";
    allRefs = true;
  };

  #source.dirs."hardware/samsung".src = builtins.fetchGit {
  #  rev = "8e2b9ef1d706f825eb3daf627116492a81b8a3c8";
  #  url = "https://github.com/LineageOS/android_hardware_samsung.git";
  #  allRefs = true;
  #};

  source.dirs."kernel/samsung/msm8974".src = builtins.fetchGit {
    rev = "ff874517b9b601475c6c3dc911729bdd317e8b1f";
    url = "https://github.com/samsung-hlte/android_kernel_samsung_msm8974.git";
    allRefs = true;
  };

  source.dirs."vendor/samsung".src = pkgs.fetchFromGitHub {
    rev = "7ebb43c52b94ebcd68fe129713cfc5f9ce3953e0";
    owner = "html6405";
    repo = "proprietary_vendor_samsung";
    hash = "sha256-i83nEabuZHrQ8D9L04iXJk6UrA352hJ/zl/PwXlRBM4=";
#    allRefs = true;
  };

  source.dirs."vendor/lineage".src = builtins.fetchGit {
    rev = "fac22bf2792973a7bb85b37744ae4cb851174e24";
    url = "https://github.com/LineageOS/android_vendor_lineage.git";
    allRefs = true;
  };

  source.dirs."packages/apps/Updater".src = builtins.fetchGit {
    rev = "587cf0bd02e90c72731851ba3a8079fbfd7964d5";
    url = "https://github.com/LineageOS/android_packages_apps_Updater.git";
    allRefs = true;
  };

  source.dirs."device/samsung/hlte".src = builtins.fetchGit {
    rev = "1ac57aea5ecfe0ef06f24f931e978151a2307731";
    url = "https://github.com/html6405/android_device_samsung_hlte.git";
    allRefs = true;
  };
}

In reply to @cyclopentane:aidoskyneen.eu
IIRC I had a similar problem while trying to implement LOS 22.2 support on my git-repo tooling rewrite feature branch, lemme check

evaluation warning: hlte is not an officially-supported device for LineageOS
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating the derivation attribute 'name'
         at /nix/store/n67nldl8x3f44w9mvk5zvij0q1rwnsmq-source/pkgs/stdenv/generic/make-derivation.nix:336:7:
          335|     // (optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
          336|       name =
             |       ^
          337|         let

       … while evaluating the option `buildNumber':

       … while evaluating the option `buildDateTime':

       … while evaluating the option `source.dirs':

       … while evaluating definitions from `/nix/store/xifnlh6fjhk1axipz9c943smq76bcmiz-source/modules/source.nix':

       … while evaluating the option `source.manifests.lineage.branch':

       … while evaluating definitions from `/nix/store/xifnlh6fjhk1axipz9c943smq76bcmiz-source/flavors/lineageos':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'hlte' missing
       at /nix/store/xifnlh6fjhk1axipz9c943smq76bcmiz-source/flavors/lineageos/default.nix:26:19:
           25|   LineageOSRelease = androidVersionToLineageBranch.${builtins.toString config.androidVersion};
           26|   defaultBranch = deviceMetadata.${config.device}.branch;
             |                   ^
           27|