diff --git a/etc/nix/fdroid.nix b/etc/nix/fdroid.nix
index 291c92c..b45fb70 100644
--- a/etc/nix/fdroid.nix
+++ b/etc/nix/fdroid.nix
@@ -22,6 +22,7 @@ let
     qrcode
     requests
     ruamel_yaml
+    libvirt
   ]
 
 ; python-with-fdroid-packages = pkgs.python3.withPackages fdroid-python-packages
diff --git a/etc/scripts/build-external-libs/clean.sh b/etc/scripts/build-external-libs/clean.sh
index cf34aab..b94eba0 100755
--- a/etc/scripts/build-external-libs/clean.sh
+++ b/etc/scripts/build-external-libs/clean.sh
@@ -35,6 +35,6 @@ source etc/scripts/build-external-libs/env.sh
 
 build_root=$BUILD_PATH
 
-chmod u+w -R $build_root
+chmod u+w -f -R $build_root || true
 rm -rf $build_root
 mkdir -p $build_root