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-rw-r--r--third_party/overlays/tvl.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/third_party/overlays/tvl.nix b/third_party/overlays/tvl.nix
index 01f7156ff19b..6c182df7d481 100644
--- a/third_party/overlays/tvl.nix
+++ b/third_party/overlays/tvl.nix
@@ -24,4 +24,8 @@ self: super: {
   clang-tools = (super.clang-tools.override {
     llvmPackages = self.llvmPackages_11;
   });
+
+  # Pick an older version of SBCL as the default, to avoid issues with
+  # warnings in newer SBCL.
+  sbcl = super.sbcl_2_0_8;
 }