diff --git a/flake.nix b/flake.nix
index cc2a48d9c..0c1bc775f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -104,6 +104,8 @@
             buildPackages.git
             buildPackages.mercurial # FIXME: remove? only needed for tests
             buildPackages.jq # Also for custom mdBook preprocessor.
+            buildPackages.bear
+            buildPackages.clang-tools
           ]
           ++ lib.optionals stdenv.hostPlatform.isLinux [(buildPackages.util-linuxMinimal or buildPackages.utillinuxMinimal)];