Use binary or c variant of psycopg depending on system

flake.nix

@@ -23,13 +23,15 @@
       devShells = forAllSystems (system:
         let
           pkgs = pkgsFor.${system};
+          extras = if pkgs.stdenv.isDarwin then [ "psycopg-c" ] else [ "psycopg-binary" ];
         in
         rec {
           evap = pkgs.callPackage ./nix/shell.nix {
             inherit (self.packages.${system}) python3;
             poetry2nix = inputs.poetry2nix.lib.mkPoetry2Nix { inherit pkgs; };
             pyproject = ./pyproject.toml;
             poetrylock = ./poetry.lock;
+            inherit extras;
           };
           evap-dev = evap.override { poetry-groups = [ "dev" ]; };
           default = evap-dev;

nix/shell.nix

@@ -1,4 +1,4 @@
-{ pkgs, python3, poetry2nix, pyproject, poetrylock, poetry-groups ? [ ], extraPackages ? [ ], extraPythonPackages ? (ps: [ ]), ... }:
+{ pkgs, lib ? pkgs.lib, python3, poetry2nix, pyproject, poetrylock, extras ? [ ], poetry-groups ? [ ], extraPackages ? [ ], extraPythonPackages ? (ps: [ ]), ... }:
 
 let
   # When running a nix shell, XDG_DATA_DIRS will be populated so that bash_completion can (lazily) find this completion script
@@ -17,11 +17,22 @@ let
   poetry-env = poetry2nix.mkPoetryEnv {
     python = python3;
     # We pass these instead of `projectDir` to avoid adding the dependency on other files.
-    inherit pyproject poetrylock;
+    inherit pyproject poetrylock extras;
     preferWheels = true;
     overrides = poetry2nix.overrides.withDefaults (final: prev: {
       # https://github.com/nix-community/poetry2nix/issues/1499
       django-stubs-ext = prev.django-stubs-ext.override { preferWheel = false; };
+
+      psycopg = prev.psycopg.overridePythonAttrs (old: {
+        buildInputs = old.buildInputs or [ ]
+          ++ lib.optionals pkgs.stdenv.isDarwin [ pkgs.openssl ];
+        propagatedBuildInputs = old.propagatedBuildInputs or [ ] ++ [ pkgs.postgresql ];
+      });
+
+      psycopg-c = prev.psycopg-c.overridePythonAttrs (old: {
+        nativeBuildInputs = old.nativeBuildInputs or [ ] ++ [ pkgs.postgresql ];
+        propagatedBuildInputs = old.propagatedBuildInputs or [ ] ++ [ final.setuptools ];
+      });
     });
     groups = poetry-groups;
     checkGroups = [ ]; # would otherwise always install dev-dependencies

pyproject.toml

@@ -12,7 +12,9 @@ django-fsm = "~2.8.2"
 Django = "~5.1.0"
 mozilla-django-oidc = "~4.0.1"
 openpyxl = "~3.1.5"
-psycopg = { version = "~3.2.3", extras = ["binary"] }
+psycopg = "~3.2.3"
+psycopg-c = { version = "~3.2.3", optional = true }
+psycopg-binary = { version = "~3.2.3", optional = true }
 redis = "~5.2.0"
 typing-extensions = "~4.12.2"
 xlwt = "~1.3.0"
@@ -34,6 +36,10 @@ tblib = "~3.0.0"
 xlrd = "~2.0.1"
 typeguard = "~4.4.0"
 
+[tool.poetry.extras]
+psycopg-c = ["psycopg-c"]
+psycopg-binary = ["psycopg-binary"]
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"