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-rw-r--r--pkgs/development/ocaml-modules/num/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/ocaml-modules/num/default.nix b/pkgs/development/ocaml-modules/num/default.nix
index 12f9aa4ca02b..d41d0f851fa5 100644
--- a/pkgs/development/ocaml-modules/num/default.nix
+++ b/pkgs/development/ocaml-modules/num/default.nix
@@ -28,7 +28,7 @@ stdenv.mkDerivation (rec {
     inherit (ocaml.meta) platforms;
     inherit (src.meta) homepage;
   };
-} // (if lib.versions.majorMinor ocaml.version == "4.06" then {
+} // (lib.optionalAttrs (lib.versions.majorMinor ocaml.version == "4.06") {
     env.NIX_CFLAGS_COMPILE = "-fcommon";
-  } else {})
+  })
 )