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-rw-r--r--pkgs/development/ocaml-modules/piqi/default.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/piqi/default.nix b/pkgs/development/ocaml-modules/piqi/default.nix
index b52c73d0534..fb5f0192c45 100644
--- a/pkgs/development/ocaml-modules/piqi/default.nix
+++ b/pkgs/development/ocaml-modules/piqi/default.nix
@@ -1,5 +1,8 @@
 { lib, stdenv, fetchFromGitHub, ocaml, findlib, which, sedlex, easy-format, xmlm, base64 }:
 
+lib.throwIf (lib.versionAtLeast ocaml.version "5.0")
+  "piqi is not available for OCaml ${ocaml.version}"
+
 stdenv.mkDerivation rec {
   version = "0.6.16";
   pname = "piqi";