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-rw-r--r--nixpkgs/pkgs/development/ocaml-modules/comparelib/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/ocaml-modules/comparelib/default.nix b/nixpkgs/pkgs/development/ocaml-modules/comparelib/default.nix
index 1d7c314f005c..1da631d683cc 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/comparelib/default.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/comparelib/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildOcaml, fetchFromGitHub, type_conv }:
+{ lib, buildOcaml, fetchFromGitHub, type_conv, camlp4 }:
 
 buildOcaml rec {
   pname = "comparelib";
@@ -13,6 +13,7 @@ buildOcaml rec {
     sha256 = "sha256-gtJvXAUxiIt/L9bCzS+8wHcCQ+QpBubwcjDcyN0K2MA=";
   };
 
+  buildInputs = [ camlp4 ];
   propagatedBuildInputs = [ type_conv ];
 
   meta = with lib; {