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-rw-r--r--pkgs/development/ocaml-modules/extlib/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/extlib/default.nix b/pkgs/development/ocaml-modules/extlib/default.nix
index 55e1c8418305..a520f8196d8a 100644
--- a/pkgs/development/ocaml-modules/extlib/default.nix
+++ b/pkgs/development/ocaml-modules/extlib/default.nix
@@ -8,6 +8,7 @@ stdenv.mkDerivation {
     sha256 = "ca6d69adeba4242ce41c02a23746ba1e464c0bbec66e2d16b02c3c6e85dc10aa";
   };
 
+  patches = [ ./hashtable-ocaml4-compat.patch ];
   buildInputs = [ocaml findlib];
 
   createFindlibDestdir = true;