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-rw-r--r--pkgs/development/ocaml-modules/checkseum/default.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/checkseum/default.nix b/pkgs/development/ocaml-modules/checkseum/default.nix
index 0e348dd65c3..18e06d260f4 100644
--- a/pkgs/development/ocaml-modules/checkseum/default.nix
+++ b/pkgs/development/ocaml-modules/checkseum/default.nix
@@ -29,6 +29,8 @@ stdenv.mkDerivation rec {
 
   inherit (dune) installPhase;
 
+  passthru = { inherit hasC; };
+
   meta = {
     homepage = "https://github.com/mirage/checkseum";
     description = "ADLER-32 and CRC32C Cyclic Redundancy Check";