diff --git a/README.md b/README.md
index 9928061..9951ea8 100644
--- a/README.md
+++ b/README.md
@@ -54,9 +54,14 @@ deliberately separate, bigger problem, not handled here.
 
 ## Requirements
 
-- `kdotool` (KWin window control on Wayland — used by the watchdog to
-  reveal the GUI window).
-- `gtk3-devel` to build `force-quit-gui` (cgo bindings via `gotk3`).
+- `dagger` CLI + a container runtime (podman or docker) — the build runs
+  in an ephemeral Nix-provisioned container (see `.dagger/main.go`), so
+  `gtk3-devel`, `dbus-devel`, and a Rust toolchain (needed to build
+  `kdotool`, which isn't packaged for Fedora) never have to be installed on
+  the host. Only the resulting binaries' *runtime* libraries matter, and
+  any normal desktop — GTK-based or not — already has `libgtk-3`,
+  `libdbus-1`, etc., since KDE/GNOME portals and GTK-using apps pull them
+  in regardless of your actual desktop toolkit.
 - Built and tested against `gotk3 v0.6.3` — v0.6.4 fails to compile its
   `gdk` package against this system's GTK3 (3.24.52) with an `undefined:
   callback` error in `gdk_since_3_22.go`'s `Seat.Grab`, an unrelated
@@ -66,17 +71,16 @@ deliberately separate, bigger problem, not handled here.
 ## Install
 
 ```
-go build -o bin/swap-watchdog ./cmd/swap-watchdog
-go build -o bin/force-quit-gui ./cmd/force-quit-gui
-mkdir -p ~/.config/systemd/user
-cp systemd/*.service ~/.config/systemd/user/
-systemctl --user daemon-reload
-systemctl --user enable --now force-quit-gui.service swap-watchdog.service
+./install.sh
 ```
 
+Builds `swap-watchdog`, `force-quit-gui`, and `kdotool` via Dagger into
+`bin/`, copies `kdotool` to `~/.local/bin`, installs the systemd user units,
+and enables + starts both services.
+
 The unit files' `ExecStart=` point at `%h/Code/swap-watchdog/bin/...` — if
 you clone this somewhere other than `~/Code/swap-watchdog`, edit the unit
-files to match before copying them.
+files to match before running `install.sh`.
 
 ## Uninstall
 
diff --git a/install.sh b/install.sh
index ac92f53..aeb33e3 100755
--- a/install.sh
+++ b/install.sh
@@ -1,7 +1,13 @@
 #!/usr/bin/env bash
-# Builds swap-watchdog / force-quit-gui and installs them as systemd user
-# services. See README.md "Install" for the manual steps this automates,
+# Builds swap-watchdog / force-quit-gui / kdotool and installs them as
+# systemd user services. See README.md "Install" for what this automates,
 # and uninstall.sh to remove them again.
+#
+# The build runs in an ephemeral Nix-provisioned container via Dagger (see
+# .dagger/main.go) instead of requiring gtk3-devel, dbus-devel, or a Rust
+# toolchain on the host -- those are only needed at build time, and the
+# resulting binaries link against the host's own GTK3/D-Bus runtime libs,
+# which any normal Linux desktop already has.
 set -eu
 
 cd "$(dirname "${BASH_SOURCE[0]}")"
@@ -13,19 +19,20 @@ if [[ "$HOME/Code/swap-watchdog" != "$(pwd)" ]]; then
 	echo "find the binaries." >&2
 fi
 
-if ! pkg-config --exists gtk+-3.0 2>/dev/null; then
-	echo "Warning: gtk+-3.0 dev files not found (need gtk3-devel) --" >&2
-	echo "building force-quit-gui will likely fail." >&2
+if ! command -v dagger >/dev/null 2>&1; then
+	echo "Error: dagger CLI not found. Install it (e.g. 'brew install dagger/tap/dagger')" >&2
+	echo "and a container runtime (podman or docker) before running this script." >&2
+	exit 1
 fi
 
-if ! command -v kdotool >/dev/null 2>&1; then
-	echo "Warning: kdotool not found -- swap-watchdog needs it at runtime" >&2
-	echo "to reveal the Force Quit Monitor window." >&2
-fi
+echo "Building swap-watchdog, force-quit-gui, and kdotool via Dagger+Nix..."
+dagger call build-linux --src=. --go-toolchain="$(go env GOROOT)" export --path=./bin
 
-echo "Building binaries..."
-go build -o bin/swap-watchdog ./cmd/swap-watchdog
-go build -o bin/force-quit-gui ./cmd/force-quit-gui
+chmod +x bin/swap-watchdog bin/force-quit-gui bin/kdotool
+
+echo "Installing kdotool to ~/.local/bin (so the systemd service can find it)..."
+mkdir -p "$HOME/.local/bin"
+cp bin/kdotool "$HOME/.local/bin/kdotool"
 
 echo "Installing unit files..."
 mkdir -p "$HOME/.config/systemd/user"
diff --git a/systemd/swap-watchdog.service b/systemd/swap-watchdog.service
index cff1e7f..2347e81 100644
--- a/systemd/swap-watchdog.service
+++ b/systemd/swap-watchdog.service
@@ -5,6 +5,7 @@ PartOf=graphical-session.target
 
 [Service]
 Type=simple
+Environment=PATH=%h/.local/bin:/usr/local/bin:/usr/bin:/bin
 ExecStart=%h/Code/swap-watchdog/bin/swap-watchdog
 Restart=always
 RestartSec=5
diff --git a/uninstall.sh b/uninstall.sh
index 30c7b5b..6498bbb 100755
--- a/uninstall.sh
+++ b/uninstall.sh
@@ -20,4 +20,7 @@ echo "Killing any still-running instances..."
 pkill -f "$HOME/Code/swap-watchdog/bin/swap-watchdog" 2>/dev/null
 pkill -f "$HOME/Code/swap-watchdog/bin/force-quit-gui" 2>/dev/null
 
-echo "Done. Source and binaries are untouched; re-run install steps from README.md to re-enable."
+echo "Removing installed kdotool..."
+rm -f "$HOME/.local/bin/kdotool"
+
+echo "Done. Source and binaries are untouched; re-run ./install.sh to re-enable."