diff --git a/flake.nix b/flake.nix
index 9fbfa07b..c4657906 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,8 +1,5 @@
 {
   description = "maralorns configuration";
-  nixConfig = {
-    allow-import-from-derivation = true;
-  };
 
   inputs = {
     secrets = {
diff --git a/home-manager/roles/mode-switching.nix b/home-manager/roles/mode-switching.nix
index d926f0ba..e14eaf36 100644
--- a/home-manager/roles/mode-switching.nix
+++ b/home-manager/roles/mode-switching.nix
@@ -18,7 +18,7 @@ in {
       echo "Running update-modes …"
       ${updateModes}/bin/update-modes
       echo "Updating system …"
-      ${pkgs.nix-output-monitor}/bin/nom build --builders @$(builders-configurator) $(readlink -f /etc/nixos)#nixosConfigurations.$(hostname).config.system.build.toplevel --allow-import-from-derivation --no-link
+      ${pkgs.nix-output-monitor}/bin/nom build --builders @$(builders-configurator) $(readlink -f /etc/nixos)#nixosConfigurations.$(hostname).config.system.build.toplevel --no-link
       /run/wrappers/bin/sudo -A /run/current-system/sw/bin/nixos-rebuild switch
       echo "Maintenance finished."
     '';
@@ -59,7 +59,7 @@ in {
           mode <- getMode
           say [i|Quick switching to mode #{mode} ...|]
           builders <- builders_configurator |> captureTrim
-          path :: Text <- decodeUtf8 <$> (nom ["build", "--builders", [i|@#{builders}|], "--allow-import-from-derivation", "--print-out-paths", "--no-link", [i|/home/maralorn/git/config\#homeConfigurations.${hostName}-#{mode}.activationPackage|]] |> captureTrim)
+          path :: Text <- decodeUtf8 <$> (nom ["build", "--builders", [i|@#{builders}|], "--print-out-paths", "--no-link", [i|/home/maralorn/git/config\#homeConfigurations.${hostName}-#{mode}.activationPackage|]] |> captureTrim)
           exe ([i|#{path}/activate|] :: String)
           update_modes
       '';
diff --git a/home-manager/roles/state.nix b/home-manager/roles/state.nix
index 0a10405d..3cea007f 100644
--- a/home-manager/roles/state.nix
+++ b/home-manager/roles/state.nix
@@ -15,7 +15,6 @@ defaultMode: {
     ".config/Signal"
     ".config/discord"
     ".config/gh"
-    ".config/VSCodium/User"
     ".contacts"
     ".gnupg"
     ".config/mpv/watch_later"
@@ -57,7 +56,6 @@ in {
     ++ [
       (mkLine "L+" "${home}/.password-store" "git/password-store")
       (mkLine "L+" "${home}/.volatile" "/disk/volatile/maralorn")
-      (mkLine "L+" "${home}/.config/nixpkgs/home.nix" "${home}/git/config/home.nix")
       (mkLine "L+" "${home}/.persist" "/disk/persist/maralorn")
       (mkLine "f" "${home}/.mode" defaultMode)
       (mkLine "f" "${home}/.config/lazygit/state.yml" "startuppopupversion: 5")
diff --git a/packages/builders-configurator/default.nix b/packages/builders-configurator/default.nix
new file mode 100644
index 00000000..7e7f8c04
--- /dev/null
+++ b/packages/builders-configurator/default.nix
@@ -0,0 +1,35 @@
+{
+  mkDerivation,
+  base,
+  containers,
+  effectful,
+  effectful-th,
+  lib,
+  relude,
+  say,
+  shh,
+  string-interpolate,
+  text,
+  witch,
+}:
+mkDerivation {
+  pname = "builders-configurator";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    base
+    containers
+    effectful
+    effectful-th
+    relude
+    say
+    shh
+    string-interpolate
+    text
+    witch
+  ];
+  license = lib.licenses.agpl3Plus;
+  mainProgram = "builders-configurator";
+}
diff --git a/packages/flake-module.nix b/packages/flake-module.nix
index 85e441ba..c26eed1f 100644
--- a/packages/flake-module.nix
+++ b/packages/flake-module.nix
@@ -4,22 +4,36 @@
   ...
 }: let
   pkgs = inputs.nixos-unstable.legacyPackages.x86_64-linux;
-  inherit (pkgs.haskell.lib.compose) appendPatch;
+  inherit (pkgs.haskell.lib.compose) appendPatch overrideCabal;
   includePatterns = [
     ".hs"
     ".cabal"
     "LICENSE"
+    "default.nix"
     "CHANGELOG.md"
   ];
   cleanCabalPackage = {
     name,
     source,
     extraPatterns ? [],
-  }: hpkgs:
-    lib.pipe source
+  }: hpkgs: let
+    cleanSource = lib.sourceFilesBySuffices source (includePatterns ++ extraPatterns);
+  in
+    lib.pipe {}
     [
-      (src: lib.sourceFilesBySuffices src (includePatterns ++ extraPatterns))
-      (src: hpkgs.callCabal2nix name src {})
+      (hpkgs.callPackage source)
+      (overrideCabal (
+        old: {
+          src = cleanSource;
+          preConfigure = ''
+            echo "Checking that default.nix is up-to-date."
+            ${hpkgs.cabal2nix}/bin/cabal2nix . > fresh-default.nix
+            cp ${cleanSource}/default.nix .
+            ${pkgs.alejandra}/bin/alejandra -q fresh-default.nix default.nix
+            ${pkgs.diffutils}/bin/diff -w default.nix fresh-default.nix
+          '';
+        }
+      ))
       hpkgs.buildFromCabalSdist
     ];
   haskellPackagesOverlay = final: prev:
diff --git a/packages/kassandra/kassandra/default.nix b/packages/kassandra/kassandra/default.nix
new file mode 100644
index 00000000..1fc1bb59
--- /dev/null
+++ b/packages/kassandra/kassandra/default.nix
@@ -0,0 +1,76 @@
+{
+  mkDerivation,
+  aeson,
+  ansi-terminal,
+  async,
+  base,
+  clay,
+  containers,
+  data-default-class,
+  extra,
+  generic-optics,
+  jsaddle,
+  jsaddle-dom,
+  lib,
+  nonempty-containers,
+  optics,
+  optics-th,
+  password,
+  patch,
+  process,
+  reflex,
+  reflex-dom,
+  relude,
+  say,
+  scientific,
+  stm,
+  string-interpolate,
+  taskwarrior,
+  template-haskell,
+  text,
+  these,
+  time,
+  unordered-containers,
+  uuid,
+  witherable,
+}:
+mkDerivation {
+  pname = "kassandra";
+  version = "0.1.0.0";
+  src = ./.;
+  libraryHaskellDepends = [
+    aeson
+    ansi-terminal
+    async
+    base
+    clay
+    containers
+    data-default-class
+    extra
+    generic-optics
+    jsaddle
+    jsaddle-dom
+    nonempty-containers
+    optics
+    optics-th
+    password
+    patch
+    process
+    reflex
+    reflex-dom
+    relude
+    say
+    scientific
+    stm
+    string-interpolate
+    taskwarrior
+    template-haskell
+    text
+    these
+    time
+    unordered-containers
+    uuid
+    witherable
+  ];
+  license = "unknown";
+}
diff --git a/packages/kassandra/standalone/default.nix b/packages/kassandra/standalone/default.nix
new file mode 100644
index 00000000..1c4e3150
--- /dev/null
+++ b/packages/kassandra/standalone/default.nix
@@ -0,0 +1,78 @@
+{
+  mkDerivation,
+  aeson,
+  base,
+  bytestring,
+  containers,
+  data-default,
+  deferred-folds,
+  dhall,
+  directory,
+  either,
+  filepath,
+  filepattern,
+  iCalendar,
+  kassandra,
+  lib,
+  network-simple,
+  nonempty-containers,
+  password,
+  paths,
+  reflex,
+  reflex-dom,
+  relude,
+  say,
+  stm,
+  stm-containers,
+  streamly,
+  streamly-bytestring,
+  taskwarrior,
+  text,
+  time,
+  tz,
+  unix,
+  uuid,
+}:
+mkDerivation {
+  pname = "standalone";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson
+    base
+    bytestring
+    containers
+    data-default
+    deferred-folds
+    dhall
+    directory
+    either
+    filepath
+    filepattern
+    iCalendar
+    kassandra
+    network-simple
+    nonempty-containers
+    password
+    paths
+    reflex
+    reflex-dom
+    relude
+    say
+    stm
+    stm-containers
+    streamly
+    streamly-bytestring
+    taskwarrior
+    text
+    time
+    tz
+    unix
+    uuid
+  ];
+  executableHaskellDepends = [base kassandra];
+  license = "unknown";
+  mainProgram = "kassandra2";
+}
diff --git a/packages/nixpkgs-bot/default.nix b/packages/nixpkgs-bot/default.nix
new file mode 100644
index 00000000..ff2857f4
--- /dev/null
+++ b/packages/nixpkgs-bot/default.nix
@@ -0,0 +1,79 @@
+{
+  mkDerivation,
+  aeson-schemas,
+  async,
+  base,
+  clock,
+  containers,
+  esqueleto,
+  exceptions,
+  graphql-client,
+  http-client,
+  lib,
+  matrix-client,
+  monad-logger,
+  mtl,
+  persistent,
+  persistent-sqlite,
+  random,
+  relude,
+  resourcet,
+  time,
+  typed-process,
+  yaml,
+}:
+mkDerivation {
+  pname = "nixpkgs-bot";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson-schemas
+    async
+    base
+    clock
+    containers
+    esqueleto
+    exceptions
+    graphql-client
+    http-client
+    matrix-client
+    monad-logger
+    mtl
+    persistent
+    persistent-sqlite
+    random
+    relude
+    resourcet
+    time
+    typed-process
+    yaml
+  ];
+  executableHaskellDepends = [
+    aeson-schemas
+    async
+    base
+    clock
+    containers
+    esqueleto
+    exceptions
+    graphql-client
+    http-client
+    matrix-client
+    monad-logger
+    mtl
+    persistent
+    persistent-sqlite
+    random
+    relude
+    resourcet
+    time
+    typed-process
+    yaml
+  ];
+  homepage = "https://git.maralorn.de/nixpkgs-bot";
+  description = "A matrix bot which watches nixpkgs and informs about PR progress";
+  license = lib.licenses.agpl3Plus;
+  mainProgram = "nixpkgs-bot";
+}
diff --git a/packages/rssfeeds/default.nix b/packages/rssfeeds/default.nix
new file mode 100644
index 00000000..53238445
--- /dev/null
+++ b/packages/rssfeeds/default.nix
@@ -0,0 +1,52 @@
+{
+  mkDerivation,
+  base,
+  containers,
+  errors,
+  exceptions,
+  extra,
+  feed,
+  filepattern,
+  lens,
+  lib,
+  megaparsec,
+  notmuch,
+  optparse-applicative,
+  purebred-email,
+  relude,
+  say,
+  string-interpolate,
+  tagsoup,
+  text,
+  time,
+  witch,
+}:
+mkDerivation {
+  pname = "rssfeeds";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    base
+    containers
+    errors
+    exceptions
+    extra
+    feed
+    filepattern
+    lens
+    megaparsec
+    notmuch
+    optparse-applicative
+    purebred-email
+    relude
+    say
+    string-interpolate
+    tagsoup
+    text
+    time
+    witch
+  ];
+  license = "unknown";
+}
diff --git a/packages/wizards-dialog/.envrc b/packages/wizards-dialog/.envrc
deleted file mode 100644
index 3550a30f..00000000
--- a/packages/wizards-dialog/.envrc
+++ /dev/null
@@ -1 +0,0 @@
-use flake
diff --git a/packages/wizards-dialog/default.nix b/packages/wizards-dialog/default.nix
new file mode 100644
index 00000000..41e528e3
--- /dev/null
+++ b/packages/wizards-dialog/default.nix
@@ -0,0 +1,47 @@
+{
+  mkDerivation,
+  aeson,
+  ansi-terminal,
+  base,
+  daemons,
+  haskeline,
+  lib,
+  process,
+  relude,
+  text,
+  witch,
+  wizards,
+  yaml,
+}:
+mkDerivation {
+  pname = "wizards-dialog";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    ansi-terminal
+    base
+    haskeline
+    process
+    relude
+    text
+    witch
+    wizards
+  ];
+  executableHaskellDepends = [
+    aeson
+    ansi-terminal
+    base
+    daemons
+    haskeline
+    process
+    relude
+    text
+    witch
+    wizards
+    yaml
+  ];
+  license = "AGPL";
+  mainProgram = "hotkeys";
+}