1 files changed, 18 insertions, 0 deletions
diff --git a/pkgs/overlay.nix b/pkgs/overlay.nix
index 09ca9ee..ebea1a0 100644
--- a/pkgs/overlay.nix
+++ b/pkgs/overlay.nix
@@ -102,4 +102,22 @@ in
   mu = oldstable.mu;
 
   matrix-to = self.callPackage ./matrix-to.nix {};
+
+  lean4 = unstable.lean4.overrideAttrs (old: rec {
+    version = "4.1.0-rc1";
+    src = self.fetchFromGitHub {
+      owner = "leanprover";
+      repo = "lean4";
+      rev = "v${version}";
+      hash = "sha256-OQ72uweFMSkOzJ9u92enNql48ReZ+NBlnXtnanH+ZVA=";
+    };
+    postPatch = ''
+      substituteInPlace src/CMakeLists.txt \
+        --replace 'set(GIT_SHA1 "")' 'set(GIT_SHA1 "${src.rev}")'
+
+      # Remove tests that fails in sandbox.
+      # It expects `sourceRoot` to be a git repository.
+      rm -rf src/lake/examples/git/
+    '';
+  });
 }