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-rw-r--r--pkgs/development/ocaml-modules/fieldslib/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/fieldslib/default.nix b/pkgs/development/ocaml-modules/fieldslib/default.nix
index 6a8db9e62816..36c1342e61fa 100644
--- a/pkgs/development/ocaml-modules/fieldslib/default.nix
+++ b/pkgs/development/ocaml-modules/fieldslib/default.nix
@@ -2,6 +2,10 @@
 
 assert stdenv.lib.versionOlder "4.00" (stdenv.lib.getVersion ocaml);
 
+if stdenv.lib.versionAtLeast ocaml.version "4.06"
+then throw "fieldslib-109.20.03 is not available for OCaml ${ocaml.version}"
+else
+
 stdenv.mkDerivation {
   name = "ocaml-fieldslib-109.20.03";