diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 51a42d4..54be796 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,17 +13,42 @@ jobs:
     steps:
     
     - uses: actions/checkout@v3
-    - uses: pguyot/arm-runner-action@v2
+
+    # From https://github.com/pguyot/arm-runner-action/blob/main/.github/workflows/test-cache.yml
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: $RUNNER_TEMP/photon_libcam_builder.img
+        key: ${{ hashFiles('**/*.yml') }}
+    - uses: pguyot/arm-runner-action@HEAD
+      id: install_deps
+      if: steps.cache.outputs.cache-hit != 'true'
+      with:
+        # we don't want to optimize as it's two-stage
+        optimize_image: no
+        image_additional_mb: 1500
+        base_image: https://downloads.raspberrypi.com/raspios_lite_arm64/images/raspios_lite_arm64-2023-12-11/2023-12-11-raspios-bookworm-arm64-lite.img.xz
+        commands: |
+            apt-get update
+            apt-get install -y libopencv-dev libegl1-mesa-dev libcamera-dev cmake build-essential libdrm-dev libgbm-dev default-jdk openjdk-17-jdk
+
+    - name: Move and rename image with dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: |
+        mv ${{ steps.install_deps.outputs.image }} $RUNNER_TEMP/photon_libcam_builder.img
+
+    - uses: pguyot/arm-runner-action@HEAD
       with:
-        base_image: raspios_lite_arm64:latest
+        base_image: file://$RUNNER_TEMP/photon_libcam_builder.img
         cpu: cortex-a7
         image_additional_mb: 1500
         bind_mount_repository: true
+        # Update again anyways to pull down the latest libcamera et al
         commands: |
             apt-get update
             apt-get install -y libopencv-dev libegl1-mesa-dev libcamera-dev cmake build-essential libdrm-dev libgbm-dev default-jdk openjdk-17-jdk
             cmake -B build-pi -DCMAKE_BUILD_TYPE=Release
-            cmake --build build-pi -j 4
+            cmake --build build-pi -- -j
 
     - run: find .
 
@@ -54,3 +79,15 @@ jobs:
       if: startsWith(github.ref, 'refs/tags/v')
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-chroot:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - run: |
+        sudo apt-get update && sudo apt-get install -y qemu qemu-user-static binfmt-support
+        docker run --mount type=bind,source=$(pwd),target=/opt/photon_sysroot/work mcm001/photon-libcamera-builder-entry:latest chroot /opt/photon_sysroot bash -c 'uname -a && cat /etc/os-release && cd /work && cmake -B build-pi -DCMAKE_BUILD_TYPE=Release && cmake --build build-pi -- -j'
+    - uses: actions/upload-artifact@master
+      with:
+        name: libcamera-driver-chroot
+        path: build-pi/*.so
diff --git a/.gitignore b/.gitignore
index e48269c..8b0f973 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 .idea/
 .vscode
 build
+build-pi
 .cache/
 compile_commands.json
+photon_sysroot
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 73a38f3..9ca75cf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.25.1)
+cmake_minimum_required(VERSION 3.15)
 project(libcamera_meme)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..31a2812
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,3 @@
+FROM ubuntu:22.04
+RUN apt-get update && apt-get install -y qemu qemu-user-static binfmt-support libopencv-dev libegl1-mesa-dev libcamera-dev cmake build-essential libdrm-dev libgbm-dev default-jdk openjdk-17-jdk && apt-get clean
+COPY photon_sysroot /opt/photon_sysroot
diff --git a/README.md b/README.md
index 793c762..90b55bc 100644
--- a/README.md
+++ b/README.md
@@ -30,3 +30,19 @@ This should spit out the shared library into the build directory.
 
 Compile with `g++ -std=c++17 -o eglinfo eglinfo.c headless_opengl.cpp -lEGL -lGLESv2 -lgbm`, and then run with  `./eglinfo`
 
+## Chroot stuff
+
+Using our docker image and run with --privileged
+
+docker run -it --privileged --mount type=bind,source="$(pwd)",target=/opt/photon_sysroot_v2023.4.2/opt/photon-libcamera-gl-driver photon-libcamera-builder:latest
+/opt/photon_sysroot_v2023.4.2/opt/photon-libcamera-gl-driver/start_chroot.sh
+
+Or
+
+docker run -it --privileged --mount type=bind,source="$(pwd)",target=/opt/photon_sysroot_v2023.4.2/opt/photon-libcamera-gl-driver photon-libcamera-builder-entry:latest
+
+# git clone ${{ github.repositoryUrl }} && cd "$(basename "$_" .git)"
+
+
+rm -rf /var/lib/apt/lists/*
+locale-gen --purge POSTIX && echo 'Success!'