--- a/tools/vkms-stereo-bench/tools/build-kwin-root.sh
+++ b/tools/vkms-stereo-bench/tools/build-kwin-root.sh
@@ -1,11 +1,13 @@
 #!/bin/bash
 # Created by Daniel Ramos (Capitain Jack) 2026/10/11
 # Copyright 2026 under the GNU GPL3 License
-# Last update 2026/10/12
+# Last update 2026/10/13
 #
-# Builds the root file system for the bench's kwin phase: Stereo KWin, kscreen-doctor (with Qt's
-# Wayland shell integration), Mesa, D-Bus, and gcc with wayland-scanner and the Wayland, EGL and GL
-# development files the two test clients need. Debian testing plus Sparky Stereo OS's packages,
+# Builds the root file system for the bench's kwin phase: Stereo KWin with the DisplayXR window-geometry
+# publisher, kscreen-doctor (with Qt's Wayland shell integration), Mesa, D-Bus, the edition's protocols,
+# KPipeWire and KRdp (the phone headset as a display), the stereo declaration and stereo layer libraries
+# with their development files, and gcc with wayland-scanner and the Wayland, EGL and GL development files
+# the two test clients need. Debian testing plus Sparky Stereo OS's packages,
 # pinned above Debian's. No root needed: mmdebstrap runs in a user namespace.
 #   tools/build-kwin-root.sh STEREO_SOURCE OUT.tar.zst
 # STEREO_SOURCE is an apt source line for Sparky Stereo OS's packages, for example
@@ -19,9 +21,13 @@
 STEREO_SOURCE=$1
 OUT=$2
 command -v mmdebstrap >/dev/null || { echo "mmdebstrap is needed (apt install mmdebstrap)" >&2; exit 1; }
-PACKAGES=kwin-wayland,displayxr-window-geometry-publisher-kwin,libkscreen-bin,qt6-wayland,mesa-libgallium,libgl1-mesa-dri,libegl-mesa0,dbus,dbus-bin,gcc,libc6-dev,pkg-config,libwayland-bin,libwayland-dev,wayland-protocols,libegl-dev,libgl-dev
+DMO_KEYRING=/usr/share/keyrings/deb-multimedia-keyring.pgp
+[ -f "$DMO_KEYRING" ] || { echo "$DMO_KEYRING is needed (install deb-multimedia-keyring from the repository's carried/ folder)" >&2; exit 1; }
+PACKAGES=ca-certificates,kwin-wayland,displayxr-window-geometry-publisher-kwin,libkscreen-bin,qt6-wayland,mesa-libgallium,libgl1-mesa-dri,libegl-mesa0,dbus,dbus-bin,gcc,libc6-dev,pkg-config,libwayland-bin,libwayland-dev,wayland-protocols,libegl-dev,libgl-dev,plasma-wayland-protocols,krdp,libkpipewire6,libkpipewirerecord6,libkpipewiredmabuf6,libstereo-declare1,libstereo-declare-dev,libstereo-layer1,libstereo-layer-dev
 mmdebstrap --mode=unshare --variant=apt --components=main --include="$PACKAGES" \
 	--setup-hook='mkdir -p "$1/etc/apt/preferences.d" && printf "Package: *\nPin: release o=Sparky Stereo OS\nPin-Priority: 1001\n" > "$1/etc/apt/preferences.d/sparky-stereo"' \
+	--setup-hook='mkdir -p "$1/usr/share/keyrings" && cp '"$DMO_KEYRING"' "$1/usr/share/keyrings/"' \
 	--customize-hook='chroot "$1" dpkg-query -W -f="\${Package}\t\${Version}\n" > "$1/etc/sparky-stereo-kwin-root.packages"' \
-	testing "$OUT" "deb http://deb.debian.org/debian testing main" "$STEREO_SOURCE"
+	testing "$OUT" "deb http://deb.debian.org/debian testing main" "$STEREO_SOURCE" \
+	"deb [signed-by=$DMO_KEYRING] https://www.deb-multimedia.org forky main non-free"
 echo "built $OUT; package list inside at /etc/sparky-stereo-kwin-root.packages"