diff --git a/.nix/cmdliner.nix b/.nix/cmdliner.nix
new file mode 100644
index 00000000..7745db14
--- /dev/null
+++ b/.nix/cmdliner.nix
@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchurl, ocaml, findlib, ocamlbuild, topkg, result }:
+
+let
+  pname = "cmdliner";
+in
+
+assert lib.versionAtLeast ocaml.version "4.01.0";
+
+let param =
+  {
+    version = "1.1.0";
+    hash = "sha256-irWd4HTlJSYuz3HMgi1de2GVL2qus0QjeCe1WdsSs8Q=";
+  }
+; in
+
+stdenv.mkDerivation rec {
+  name = "ocaml${ocaml.version}-${pname}-${version}";
+  inherit (param) version;
+
+  src = fetchurl {
+    url = "https://erratique.ch/software/${pname}/releases/${pname}-${version}.tbz";
+    inherit (param) hash;
+  };
+
+  nativeBuildInputs = [ ocaml ocamlbuild findlib ];
+  buildInputs = [ topkg ];
+  propagatedBuildInputs = [ result ];
+
+  inherit (topkg) buildPhase installPhase;
+
+  meta = with lib; {
+    homepage = "https://erratique.ch/software/cmdliner";
+    description = "An OCaml module for the declarative definition of command line interfaces";
+    license = licenses.bsd3;
+    platforms = ocaml.meta.platforms or [];
+    maintainers = [ ];
+  };
+}
\ No newline at end of file
diff --git a/release.nix b/release.nix
index f1859d38..a21f81e2 100644
--- a/release.nix
+++ b/release.nix
@@ -4,4 +4,5 @@ with pkgs;
 ocamlPackages.callPackage ./. {
   bindlib = ocamlPackages.callPackage ./.nix/bindlib.nix { };
   unionfind = ocamlPackages.callPackage ./.nix/unionfind.nix { };
+  cmdliner = ocamlPackages.callPackage ./.nix/cmdliner.nix { };
 }
diff --git a/shell.nix b/shell.nix
index 9470086e..89656da8 100644
--- a/shell.nix
+++ b/shell.nix
@@ -5,6 +5,7 @@ let
   pkg = ocamlPackages.callPackage ./. {
     bindlib = ocamlPackages.callPackage ./.nix/bindlib.nix { };
     unionfind = ocamlPackages.callPackage ./.nix/unionfind.nix { };
+    cmdliner = ocamlPackages.callPackage ./.nix/cmdliner.nix { };
   };
 in mkShell {
   inputsFrom = [ pkg ];