Voici le résultat :

$ nix-store -q $(readlink -f $(which dropbox)) --deriver
/nix/store/m8z2613wh27drpin165yf4ild2v4i4xm-dropbox-cli-2023.09.06.drv

$ nix derivation show /nix/store/m8z2613wh27drpin165yf4ild2v4i4xm-dropbox-cli-2023.09.06.drv
warning: The interpretation of store paths arguments ending in `.drv` recently changed. If this command is now failing try again with '/nix/store/m8z2613wh27drpin165yf4ild2v4i4xm-dropbox-cli-2023.09.06.drv^*'
{
  "/nix/store/m8z2613wh27drpin165yf4ild2v4i4xm-dropbox-cli-2023.09.06.drv": {
    "args": [
      "-e",
      "/nix/store/v6x3cs394jgqfbi0a42pam708flxaphh-default-builder.sh"
    ],
    "builder": "/nix/store/7dpxg7ki7g8ynkdwcqf493p2x8divb4i-bash-5.2-p15/bin/bash",
    "env": {
      "__structuredAttrs": "",
      "buildInputs": "/nix/store/p1zbyfrpj3hq50mxh5hmxl3kqpa2b1am-python3-3.11.6 /nix/store/557526w6ibp1p828p3fkf3jfxxij10f3-gtk4-4.12.4-dev /nix/store/727l7xncrvqijf7hl9y9jvmvq42qzr4h-nautilus-45.2.1-dev",
      "builder": "/nix/store/7dpxg7ki7g8ynkdwcqf493p2x8divb4i-bash-5.2-p15/bin/bash",
      "cmakeFlags": "",
      "configureFlags": "--with-nautilus-extension-dir=/14fa73fv0kkx56qpvqzz0gj93zckk998smj68yn46x91ncy0s1wz/lib/nautilus/extension-4",
      "depsBuildBuild": "",
      "depsBuildBuildPropagated": "",
      "depsBuildTarget": "",
      "depsBuildTargetPropagated": "",
      "depsHostHost": "",
      "depsHostHostPropagated": "",
      "depsTargetTarget": "",
      "depsTargetTargetPropagated": "",
      "doCheck": "",
      "doInstallCheck": "",
      "makeFlags": "EMBLEM_DIR=/14fa73fv0kkx56qpvqzz0gj93zckk998smj68yn46x91ncy0s1wz/share/nautilus-dropbox/emblems",
      "mesonFlags": "",
      "name": "dropbox-cli-2023.09.06",
      "nativeBuildInputs": "/nix/store/nsl35d8x8jp0vy8n4xy8sx9v68gdh444-autoreconf-hook /nix/store/3ck7yhjzm3h5m3984ni6mj6nbq4saya0-pkg-config-wrapper-0.29.2 /nix/store/ansdvsscwlrp2pc8c2b83yv0g205zbz8-gobject-introspection-wrapped-1.78.1-dev /nix/store/ffnmna1zvdd4v574xwjzwy0x5cymgrbw-gdk-pixbuf-2.42.10-dev /nix/store/qpbph0cv72cg9msfjrpc9pw8gr66r88n-python3-3.11.6-env",
      "nautilusExtension": "/nix/store/0q8jy4g3j7gjf0kiqabf3c8rgdhv3syc-dropbox-cli-2023.09.06-nautilusExtension",
      "out": "/nix/store/lnjl85z5qh9yx76rdzcv8sni5q1b4nls-dropbox-cli-2023.09.06",
      "outputs": "out nautilusExtension",
      "patches": "/nix/store/43vylq1a9lgg2064x5x7r8ymkz1bzx9n-fix-cli-paths.patch",
      "pname": "dropbox-cli",
      "propagatedBuildInputs": "",
      "propagatedNativeBuildInputs": "",
      "src": "/nix/store/r285bs4cyhb2ckbrjmmwipb9ciag0hg1-nautilus-dropbox-2023.09.06.tar.bz2",
      "stdenv": "/nix/store/kv5wkk7xgc8paw9azshzlmxraffqcg0i-stdenv-linux",
      "strictDeps": "1",
      "system": "x86_64-linux",
      "version": "2023.09.06"
    },
    "inputDrvs": {
      "/nix/store/0ia8rh4vrdbr5baapq71jsppn8bzvm90-pkg-config-wrapper-0.29.2.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/17y7qa8g11q2pg98780ndznjg4aps05m-fix-cli-paths.patch.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/2ggx2bfw6w9ms4pj7dylld6ghds9ig01-python3-3.11.6.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/9jgrhm7p2y6ma4ki60za565hx4bx7lwh-gtk4-4.12.4.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "dev"
        ]
      },
      "/nix/store/hgbbq9lb8f6r5mal3i63l0kq7qzyd80y-python3-3.11.6-env.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/ks5ivc59k57kwii93qlsfgcx2a7xma1k-autoreconf-hook.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/lhs2dgxgafj79igqjww9iwxw8hsl9xgn-gdk-pixbuf-2.42.10.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "dev"
        ]
      },
      "/nix/store/mvvhw7jrrr8wnjihpalw4s3y3g7jihgw-stdenv-linux.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/n8gshsh6s2k3j2ks6ac520hiva49wx3h-nautilus-dropbox-2023.09.06.tar.bz2.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/szciaprmwb7kdj7zv1b56midf7jfkjnw-bash-5.2-p15.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "out"
        ]
      },
      "/nix/store/yb60ih5v06gw2vq2c3cy5rmdhs2234jv-gobject-introspection-wrapped-1.78.1.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "dev"
        ]
      },
      "/nix/store/zn9f0cbryfikcg1sdl1sg29r8amnxy8s-nautilus-45.2.1.drv": {
        "dynamicOutputs": {},
        "outputs": [
          "dev"
        ]
      }
    },
    "inputSrcs": [
      "/nix/store/v6x3cs394jgqfbi0a42pam708flxaphh-default-builder.sh"
    ],
    "name": "dropbox-cli-2023.09.06",
    "outputs": {
      "nautilusExtension": {
        "path": "/nix/store/0q8jy4g3j7gjf0kiqabf3c8rgdhv3syc-dropbox-cli-2023.09.06-nautilusExtension"
      },
      "out": {
        "path": "/nix/store/lnjl85z5qh9yx76rdzcv8sni5q1b4nls-dropbox-cli-2023.09.06"
      }
    },
    "system": "x86_64-linux"
  }
}

$ systemctl cat --user dropbox
# /home/horacio/.config/systemd/user/dropbox.service
[Install]
WantedBy=default.target

[Service]
Environment=HOME=/home/horacio/.dropbox-hm
Environment=DISPLAY=
ExecReload=/nix/store/m38gwq0w8w7qyjn9s00balyp7cv3m5p9-coreutils-9.3/bin/kill -HUP $MAINPID
ExecStart=/nix/store/a5fvmnmm816a9sy00r1fy5k8pp9gw9yk-dropbox-start
ExecStop=/nix/store/lnjl85z5qh9yx76rdzcv8sni5q1b4nls-dropbox-cli-2023.09.06/bin/dropbox stop
Nice=10
PIDFile=/home/horacio/.dropbox-hm/.dropbox/dropbox.pid
PrivateTmp=true
ProtectSystem=full
Restart=on-failure
Type=forking

[Unit]
Description=dropbox

Le package python311Packages.napari-npe2 est cassé

error: builder for '/nix/store/2fw79aw7cr2nja7fa4l0d4ma0dli54px-python3.11-napari-npe2-0.7.2-unstable-2023-10-20.drv' failed with exit code 1;
       last 10 log lines:
       > Creating a wheel...
       > * Getting build dependencies for wheel...
       > * Building wheel...
       > Successfully built npe2-0.7.2-py3-none-any.whl
       > Finished creating a wheel...
       > Finished executing pypaBuildPhase
       > Running phase: pythonRuntimeDepsCheckHook
       > Executing pythonRuntimeDepsCheck
       > Checking runtime dependencies for npe2-0.7.2-py3-none-any.whl
       >   - tomli-w not installed
       For full logs, run 'nix log /nix/store/2fw79aw7cr2nja7fa4l0d4ma0dli54px-python3.11-napari-npe2-0.7.2-unstable-2023-10-20.drv'.