Add SamRewritten as a custom derivation.

.bauke/nix/stardust/packages.nix

@@ -65,6 +65,7 @@
       xfce.xfce4-timer-plugin
       xfce.xfce4-whiskermenu-plugin
       xorg.libXcursor
+      (callPackage ./samrewritten.nix { })
       (wrapOBS {
         plugins = with obs-studio-plugins; [
           input-overlay

.bauke/nix/stardust/samrewritten.nix

@@ -0,0 +1,34 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, pkg-config
+, curl
+, glibmm
+, gtkmm3
+, steam
+, yajl
+}:
+
+stdenv.mkDerivation rec {
+  pname = "SamRewritten";
+  version = "202008";
+
+  src = fetchFromGitHub {
+    owner = "PaulCombal";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-q3kDuZdnWw1Nfu3hVDD8XKJzbmwlx/lafJfhziVYKhw=";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ curl glibmm gtkmm3 steam yajl ];
+
+  installFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    description = "Steam Achievement Manager For Linux. Rewritten in C++.";
+    homepage = "https://github.com/PaulCombal/SamRewritten";
+    license = licenses.gpl3;
+    platforms = [ "x86_64-linux" ];
+  };
+}