diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..9ef2c5d
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,22 @@
+{ mkDerivation, base, containers, mtl, multiset, process
+, lib, tasty, tasty-hunit
+# python package needed at test and run time, undeclared in .cabal file
+, paganini-hs, paganini
+}:
+mkDerivation {
+  pname = "generic-boltzmann-brain";
+  version = "0.1.0.0";
+  src = ./.;
+  libraryHaskellDepends = [
+    base containers mtl multiset process tasty tasty-hunit
+  ];
+  testHaskellDepends = [
+    base
+    tasty
+    tasty-hunit
+    paganini-hs
+    paganini
+  ];
+  homepage = "https://github.com/maciej-bendkowski/generic-boltzmann-brain#readme";
+  license = lib.licenses.bsd3;
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..1a7760b
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,95 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1605370193,
+        "narHash": "sha256-YyMTf3URDL/otKdKgtoMChu4vfVL3vCMkRqpGifhUn0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5021eac20303a61fafe17224c087f5519baed54d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1676150441,
+        "narHash": "sha256-Nfeua9Ua/dGHOQpzOjLtkyMyW/ysQCvZJ9Dd74QQSNk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "6d87734c880d704f6ee13e5c0fe835b98918c34e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1676060830,
+        "narHash": "sha256-OZJKL08qbLW2xMPNPTgidbC25MrkllUonoFs/JOX4y8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9943fcc75d4e43c3116b408b0f93e682927ffbb4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "paganini-hs": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1676297967,
+        "narHash": "sha256-uN0uDqErRwPkmSQd2Guu6b01HldI8n5KAhdjR0ETEew=",
+        "owner": "maciej-bendkowski",
+        "repo": "paganini-hs",
+        "rev": "214013fdc8aa274d2e92d50484bc0f840bf77f18",
+        "type": "github"
+      },
+      "original": {
+        "owner": "maciej-bendkowski",
+        "repo": "paganini-hs",
+        "rev": "214013fdc8aa274d2e92d50484bc0f840bf77f18",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "paganini-hs": "paganini-hs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..79fd3b1
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,108 @@
+{
+  description = "Generic Boltzmann Brain";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    paganini-hs.url = "github:maciej-bendkowski/paganini-hs/214013fdc8aa274d2e92d50484bc0f840bf77f18";
+  };
+
+  outputs =
+    {
+      self
+    , nixpkgs
+    , flake-utils
+    , paganini-hs
+    , ...
+    }@inputs:
+      flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+      let
+
+        name = "generic-boltzmann-brain";
+        compiler = "ghc925";
+
+        pkgs = import nixpkgs {
+          inherit system;
+          config = {
+            allowUnfree = true;
+            allowBroken = true;
+            allowUnsupportedSystem = true;
+          };
+        };
+
+        optas = p: with p;
+          (
+            buildPythonPackage rec {
+              pname = "optas";
+              version = "1.0.3";
+              src = fetchPypi {
+                inherit pname version;
+                sha256 = "sha256-92aaW9ZxvRy/dfYhw7IS+lfDAP2UuBuJhNDNTW7Xkzc=";
+              };
+              doCheck = false;
+            }
+          );
+
+        paganini = p: with p;
+          (
+            buildPythonPackage rec {
+              pname = "paganini";
+              version = "1.5.0";
+              src = fetchPypi {
+                inherit pname version;
+                sha256 = "sha256-hsDqONhBPQlgQHKBh5tdp/pzoXynUz7ztXXILrGgslo=";
+              };
+              doCheck = false;
+              propagatedBuildInputs = [
+                pkgs.python3Packages.numpy
+                pkgs.python3Packages.sympy
+                pkgs.python3Packages.scipy
+                pkgs.python3Packages.networkx
+                pkgs.python3Packages.cvxpy
+                (optas p)
+              ];
+            }
+          );
+
+        pythonPackages = p: with p; [
+          (optas p)
+          (paganini p)
+        ];
+
+        haskellPackages = pkgs.haskell.packages.${compiler}.override {
+          overrides = self: super: {
+            "${name}" = (self.callCabal2nix "generic-boltzmann-brain" ./. {}).overrideAttrs(
+              old: {
+                nativeBuildInputs = old.nativeBuildInputs ++ [
+                  (pkgs.python3.withPackages pythonPackages)
+                ];
+              }
+            );
+
+            paganini-hs = pkgs.haskell.lib.dontCheck (
+              super.callCabal2nix "paganini-hs" paganini-hs {});
+          };
+        };
+
+        devShell = haskellPackages.shellFor {
+          withHoogle = true; # Provides docs, optional.
+          packages = p: [
+            p.generic-boltzmann-brain
+          ];
+          buildInputs = [
+            haskellPackages.stack
+            haskellPackages.haskell-language-server
+            haskellPackages.hlint
+            haskellPackages.fourmolu
+            (pkgs.python3.withPackages pythonPackages)
+          ];
+        };
+
+        defaultPackage = haskellPackages."${name}";
+        derive = import ./.;
+
+      in
+        {
+          inherit derive defaultPackage devShell;
+        });
+}