2 files changed, 12 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/development/ocaml-modules/trace/default.nix b/nixpkgs/pkgs/development/ocaml-modules/trace/default.nix
index a27a61d4baf1..2c7356669860 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/trace/default.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/trace/default.nix
@@ -2,13 +2,13 @@
 
 buildDunePackage rec {
   pname = "trace";
-  version = "0.3";
+  version = "0.5";
 
   minimalOCamlVersion = "4.07";
 
   src = fetchurl {
-    url = "https://github.com/c-cube/ocaml-trace/releases/download/${version}/trace-${version}.tbz";
-    hash = "sha256-Krq6qYO7tKJktTRjFrdmONPHfjrd81Ighsb9nmG9ZQU=";
+    url = "https://github.com/c-cube/ocaml-trace/releases/download/v${version}/trace-${version}.tbz";
+    hash = "sha256-l0NvWPGBd1WR+b50WXEYfptuCUjda8MlZ/o5YngRNIg=";
   };
 
   meta = {
diff --git a/nixpkgs/pkgs/development/ocaml-modules/trace/tef.nix b/nixpkgs/pkgs/development/ocaml-modules/trace/tef.nix
index c1a6f9251554..eeeda78f580d 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/trace/tef.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/trace/tef.nix
@@ -4,6 +4,15 @@ buildDunePackage {
   pname = "trace-tef";
   inherit (trace) src version;
 
+  # This removes the dependency on the “atomic” package
+  # (not available in nixpkgs)
+  # Said package for OCaml ≥ 4.12 is empty
+  postPatch = ''
+    substituteInPlace src/tef/dune --replace 'atomic ' ""
+  '';
+
+  minimalOCamlVersion = "4.12";
+
   propagatedBuildInputs = [ mtime trace ];
 
   doCheck = true;