diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 07a08ee5..bbfc1c66 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -3,17 +3,23 @@ on:
   push:
     branches: [develop]
 
+
 jobs:
-  lints:
-    name: Build
-    runs-on: ubuntu-22.04
+  os-configurations:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-13]
+    name: OS configurations
+    runs-on: ${{ matrix.os }}
     permissions:
       id-token: "write"
       contents: "read"
     steps:
-    - uses: actions/checkout@v4
-    - uses: DeterminateSystems/nix-installer-action@main
-    - uses: DeterminateSystems/magic-nix-cache-action@main
-    - uses: DeterminateSystems/flake-checker-action@main
-    # - name: Run `nix build`
-    #   run: nix build .
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: DeterminateSystems/flake-checker-action@main
+      - run: |
+          nix build .#build-os-configurations
+          ls -lha result/
diff --git a/flake.nix b/flake.nix
index e433a3e8..00961c0b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -86,9 +86,7 @@
 
     tx5.url = "github:holochain/tx5/tx5-signal-srv-v0.0.8-alpha";
     tx5.flake = false;
-    sbd.url =
-      "github:holochain/sbd/sbd-server-v0.0.4-alpha"
-      ;
+    sbd.url = "github:holochain/sbd/sbd-server-v0.0.4-alpha";
     sbd.flake = false;
 
     holochain-versions.url = "github:holochain/holochain?dir=versions/weekly";
@@ -137,6 +135,7 @@
         inputs',
         pkgs,
         lib,
+        system,
         ...
       }: {
         # Per-system attributes can be defined here. The self' and inputs'
@@ -223,11 +222,36 @@
             '';
           };
 
-        packages = {
-          nomad = inputs'.nixpkgs.legacyPackages.nomad_1_6;
-
-          nixos-anywhere = inputs'.nixos-anywhere.packages.default;
-        };
+        packages =
+          {
+            # nomad = pkgs.nomad_1_6;
+
+            nixos-anywhere = inputs'.nixos-anywhere.packages.default;
+          }
+          // (
+            let
+              mkOsConfigCheck = osConfigs: let
+                filteredBySystem = lib.filterAttrs (key: value: value.pkgs.system == system) osConfigs;
+                asStrings = lib.mapAttrsToList (key: value: builtins.trace "evaluating ${key} (${value.pkgs.system})..." "ln -s ${value.config.system.build.toplevel} $out/") filteredBySystem;
+              in
+                pkgs.stdenv.mkDerivation {
+                  name = "check-osconfigurations";
+                  phases = "installPhase";
+                  installPhase = "mkdir $out;" + builtins.concatStringsSep "\n" asStrings;
+                };
+            in {
+              build-os-configurations =
+                if pkgs.stdenv.isLinux
+                then
+                  mkOsConfigCheck (builtins.removeAttrs self.nixosConfigurations [
+                    # too big for current CI structure and rarely used
+                    "vm-nixcache"
+                  ])
+                else if pkgs.stdenv.isDarwin
+                then mkOsConfigCheck self.darwinConfigurations
+                else throw "unexpected case";
+            }
+          );
       };
       flake = {
         # The usual flake attributes can be defined here, including system-