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diff --git a/third_party/lisp/closer-mop.nix b/third_party/lisp/closer-mop.nix
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+# Closer to MOP is a compatibility layer that rectifies many of the
+# absent or incorrect CLOS MOP features across a broad range of Common
+# Lisp implementations
+{ depot, ... }:
+
+let src = depot.third_party.fetchFromGitHub {
+  owner = "pcostanza";
+  repo = "closer-mop";
+  rev = "e1d1430524086709a7ea8e0eede6849aa29d6276";
+  sha256 = "1zda6927379pmrsxpg29jnj6azjpa2pms9h7n1iwhy6q9d3w06rf";
+};
+in depot.nix.buildLisp.library {
+  name = "closer-mop";
+
+  srcs = [
+    "${src}/closer-mop-packages.lisp"
+    "${src}/closer-mop-shared.lisp"
+    "${src}/closer-sbcl.lisp"
+  ];
+}