diff --git a/pkgs/development/ocaml-modules/0install-solver/default.nix b/pkgs/development/ocaml-modules/0install-solver/default.nix
new file mode 100644
index 000000000000..2801fbf47b89
--- /dev/null
+++ b/pkgs/development/ocaml-modules/0install-solver/default.nix
@@ -0,0 +1,30 @@
+{
+  lib,
+  buildDunePackage,
+  fetchFromGitHub,
+  ounit2,
+}:
+
+buildDunePackage (finalAttrs: {
+  pname = "0install-solver";
+  version = "2.18";
+
+  src = fetchFromGitHub {
+    owner = "0install";
+    repo = "0install";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-CxADWMYZBPobs65jeyMQjqu3zmm2PgtNgI/jUsYUp8I=";
+  };
+
+  doCheck = true;
+  checkInputs = [
+    ounit2
+  ];
+
+  meta = {
+    description = "Package dependency solver";
+    license = lib.licenses.lgpl21;
+    maintainers = [ lib.maintainers.stepbrobd ];
+    homepage = "https://0install.net";
+  };
+})
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 92da02d990d1..0238b551db01 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -2211,6 +2211,10 @@ let
 
         zmq-lwt = callPackage ../development/ocaml-modules/zmq/lwt.nix { };
 
+        ### _ ###
+
+        _0install-solver = callPackage ../development/ocaml-modules/0install-solver { };
+
         ### Exceptional packages kept out of order ###
 
         # Libs