trying some stuff

packages/convex/default.nix

@@ -0,0 +1,59 @@
+{ 
+  lib, 
+  stdenv, 
+  rustPlatform, 
+  fetchFromGitHub, 
+  
+  # dependencies
+  openssl, 
+  pkg-config, 
+  cmake,
+  llvmPackages,
+  postgresql, 
+  sqlite, 
+  
+  #options
+  dbBackend ? "postgresql", 
+
+  ... 
+}:
+rustPlatform.buildRustPackage rec {
+  pname = "convex";
+  version = "2025-08-20-c9b561e";
+
+  src = fetchFromGitHub {
+    owner = "get-convex";
+    repo = "convex-backend";
+    rev = "c9b561e1b365c85ef28af35d742cb7dd174b5555";
+    hash = "sha256-4h4AQt+rQ+nTw6eTbbB5vqFt9MFjKYw3Z7bGXdXijJ0=";
+  };
+
+  cargoHash = "sha256-pcDNWGrk9D0qcF479QAglPLFDZp27f8RueP5/lq9jho=";
+
+  cargoBuildFlags = [
+    "-p" "local_backend"
+    "--bin" "convex-local-backend"
+  ];
+
+  env = {
+    LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+  };
+
+  strictDeps = true;
+
+  # Build-time dependencies
+  nativeBuildInputs = [ pkg-config cmake rustPlatform.bindgenHook ];
+
+  # Run-time dependencies
+  buildInputs = 
+    [ openssl ]
+    ++ lib.optional (dbBackend == "sqlite") sqlite
+    ++ lib.optional (dbBackend == "postgresql") postgresql;
+
+  buildFeatures = "";
+
+  meta = with lib; {
+    license = licenses.fsl11Asl20;
+    mainProgram = "convex";
+  };
+}