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-rw-r--r--third_party/nix/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/third_party/nix/default.nix b/third_party/nix/default.nix
index 1ab729e43af5..bbd0e0120a1d 100644
--- a/third_party/nix/default.nix
+++ b/third_party/nix/default.nix
@@ -81,6 +81,7 @@ in pkgs.llvmPackages.libcxxStdenv.mkDerivation {
     mkdir build
     cd build
     cmake .. \
+      -DCMAKE_CXX_FLAGS='-Wall -Werror' \
       -DCMAKE_INSTALL_PREFIX=$out \
       -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY=OFF \