diff --git a/stdlib/regression/dune b/stdlib/regression/dune
index cf12a75a0..0f6430d20 100644
--- a/stdlib/regression/dune
+++ b/stdlib/regression/dune
@@ -1,9 +1,13 @@
 ; This file was autogenerated
 
 (cram (deps ../../src/Driver.exe))
-(cram (deps ../../runtime32/runtime.a ../../runtime32/Std.i))
+(cram
+ (enabled_if (= %{system} "linux"))
+ (deps ../../runtime32/runtime.a ../../runtime32/Std.i))
 (cram (deps ../../runtime/runtime.a ../../runtime/Std.i))
-(cram (deps ../x32/Array.i ../x32/Array.o ../x32/Buffer.i ../x32/Buffer.o ../x32/Collection.i ../x32/Collection.o ../x32/Data.i ../x32/Data.o ../x32/Fun.i ../x32/Fun.o ../x32/Lazy.i ../x32/Lazy.o ../x32/List.i ../x32/List.o ../x32/Matcher.i ../x32/Matcher.o ../x32/Ostap.i ../x32/Ostap.o ../x32/Random.i ../x32/Random.o ../x32/Ref.i ../x32/Ref.o ../x32/STM.i ../x32/STM.o ../x32/Timer.i ../x32/Timer.o))
+(cram
+ (enabled_if (= %{system} "linux"))
+ (deps ../x32/Array.i ../x32/Array.o ../x32/Buffer.i ../x32/Buffer.o ../x32/Collection.i ../x32/Collection.o ../x32/Data.i ../x32/Data.o ../x32/Fun.i ../x32/Fun.o ../x32/Lazy.i ../x32/Lazy.o ../x32/List.i ../x32/List.o ../x32/Matcher.i ../x32/Matcher.o ../x32/Ostap.i ../x32/Ostap.o ../x32/Random.i ../x32/Random.o ../x32/Ref.i ../x32/Ref.o ../x32/STM.i ../x32/STM.o ../x32/Timer.i ../x32/Timer.o))
 (cram (deps ../x64/Array.i ../x64/Array.o ../x64/Buffer.i ../x64/Buffer.o ../x64/Collection.i ../x64/Collection.o ../x64/Data.i ../x64/Data.o ../x64/Fun.i ../x64/Fun.o ../x64/Lazy.i ../x64/Lazy.o ../x64/List.i ../x64/List.o ../x64/Matcher.i ../x64/Matcher.o ../x64/Ostap.i ../x64/Ostap.o ../x64/Random.i ../x64/Random.o ../x64/Ref.i ../x64/Ref.o ../x64/STM.i ../x64/STM.o ../x64/Timer.i ../x64/Timer.o))
 (cram (applies_to test01)
   (deps test01.lama))
diff --git a/stdlib/regression/gen.ml b/stdlib/regression/gen.ml
index 8d1caaac6..97c5ed8bc 100644
--- a/stdlib/regression/gen.ml
+++ b/stdlib/regression/gen.ml
@@ -7,11 +7,17 @@ let sprintf = Printf.sprintf
 let () =
   Out_channel.with_open_text "dune" (fun dunech ->
       let dprintfn fmt = Format.kasprintf (Printf.fprintf dunech "%s\n") fmt in
+      let iflinux () = dprintfn " (enabled_if (= %%{system} \"linux\"))" in
       dprintfn "; This file was autogenerated\n";
       dprintfn "(cram (deps ../../src/Driver.exe))";
-      dprintfn "(cram (deps ../../runtime32/runtime.a ../../runtime32/Std.i))";
+      dprintfn "(cram";
+      iflinux ();
+      dprintfn " (deps ../../runtime32/runtime.a ../../runtime32/Std.i))";
       dprintfn "(cram (deps ../../runtime/runtime.a ../../runtime/Std.i))";
-      dprintfn "(cram (deps %s))"
+
+      dprintfn "(cram";
+      iflinux ();
+      dprintfn " (deps %s))"
         (String.concat " " (List.concat_map (fun s ->
             [sprintf "../x32/%s.i" s
             ;sprintf "../x32/%s.o" s