diff --git a/developer_toolbox/build_locally.sh b/developer_toolbox/build_locally.sh
index 804d7f05c..7e42eefd4 100755
--- a/developer_toolbox/build_locally.sh
+++ b/developer_toolbox/build_locally.sh
@@ -2,4 +2,59 @@
 
 # WARNING: run this script from the project root folder, not from here!!
 
-cmake -DRETRODECK=on -DCMAKE_INSTALL_PREFIX=/app . && make && sudo make install
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+inject(){
+
+    flatpak_user_installation="$HOME/.local/share/flatpak/app/net.retrodeck.retrodeck/current/active/files"
+    flatpak_system_installation="/var/lib/flatpak/app/net.retrodeck.retrodeck/current/active/files"
+
+    force_user=false
+    force_system=false
+
+    # Parse arguments
+    while [[ "$#" -gt 0 ]]; do
+        case $1 in
+            --force-user) force_user=true ;;
+            --force-system) force_system=true ;;
+            *) echo "Unknown parameter: $1"; exit 1 ;;
+        esac
+        shift
+    done
+
+    # Determine installation path
+    if [ "$force_user" = true ]; then
+        echo "Forcing user mode installation."
+        app="$flatpak_user_installation"
+    elif [ "$force_system" = true ]; then
+        echo "Forcing system mode installation."
+        app="$flatpak_system_installation"
+    elif [ -d "$flatpak_user_installation" ]; then
+        echo "RetroDECK is installed in user mode, proceeding."
+        app="$flatpak_user_installation"
+    elif [ -d "$flatpak_system_installation" ]; then
+        echo "RetroDECK is installed in system mode, proceeding."
+        app="$flatpak_system_installation"
+    else
+        echo "RetroDECK installation not found, are you inside a flatpak? Quitting"
+        exit 1
+    fi
+
+    # Copying files to the installation
+    sudo make install DESTDIR="$app"
+
+}
+
+cmake -DRETRODECK=on -DCMAKE_INSTALL_PREFIX=/app . && make
+read -p "Do you want to inject the files in this RetroDECK installation? (y/n): " choice
+case "$choice" in 
+    y|Y )
+        echo "Injecting files..."
+        inject
+    ;;
+    n|N )
+        echo "Skipping file injection."
+        sudo make install
+    ;;
+    * )
+        echo "Invalid choice. Skipping file injection."
+    ;;
+esac
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