add steamworks include

pkgs/default.nix

@@ -11,4 +11,5 @@ final: prev: {
   buildSourcePawnScript = final.callPackage ./build-sourcepawn-script.nix {};
   sourcemod-include-library = final.callPackage ./includes/sourcemod-include-library.nix {};
   sourcemod-include-curl = final.callPackage ./includes/curl.nix {};
+  sourcemod-include-steamworks = final.callPackage ./includes/steamworks.nix {};
 }

pkgs/includes/steamworks.nix

@@ -0,0 +1,23 @@
+{
+  stdenv,
+  fetchFromGitHub,
+}:
+stdenv.mkDerivation rec {
+  pname = "sourcemod-include-steamworks";
+  version = "1.2.3c";
+
+  src = fetchFromGitHub {
+    owner = "JoinedSenses";
+    repo = "SourceMod-IncludeLibrary";
+    rev = "9d4e4263b77aa0c4fcdadd498c1420c64b3c1c10";
+    hash = "sha256-kO3iRHr3D0qLmgMh4SD3yz14bxSUD0r9pi6dHj8dnN0=";
+  };
+
+  doConfigure = false;
+  doBuild = false;
+
+  installPhase = ''
+    mkdir -p $out/include
+    cp -r include/steamworks.inc $out/include
+  '';
+}

pkgs/sourcepawn.nix

@@ -9,6 +9,7 @@
   sourcemod-includes,
   sourcemod-include-curl,
   sourcemod-include-library,
+  sourcemod-include-steamworks,
   runCommand,
 }: let
   inherit (builtins) concatStringsSep substring stringLength;
@@ -59,6 +60,7 @@
         library = sourcemod-include-library;
         sourcemod = sourcemod-includes;
         curl = sourcemod-include-curl;
+        steamworks = sourcemod-include-steamworks;
       };
       buildEnv = imports: let
         unwrapped = symlinkJoin {