1 files changed, 5 insertions, 2 deletions
diff --git a/nixpkgs/pkgs/development/ocaml-modules/cstruct/sexp.nix b/nixpkgs/pkgs/development/ocaml-modules/cstruct/sexp.nix
index 742cb6522ebf..b04810e48038 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/cstruct/sexp.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/cstruct/sexp.nix
@@ -8,8 +8,11 @@ buildDunePackage rec {
   pname = "cstruct-sexp";
   inherit (cstruct) version src useDune2 meta;
 
-  doCheck = lib.versionAtLeast ocaml.version "4.03";
-  checkInputs = lib.optional doCheck alcotest;
+  minimumOCamlVersion = "4.03";
+
+  # alcotest is only available on OCaml >= 4.05 due to fmt
+  doCheck = lib.versionAtLeast ocaml.version "4.05";
+  checkInputs = [ alcotest ];
 
   propagatedBuildInputs = [ cstruct sexplib ];
 }