Compile Conduit ourselves

no more IFD

pkgs/conduit/default.nix

@@ -0,0 +1,25 @@
+{
+  lib,
+  stdenv,
+  fenix,
+  crane,
+  src,
+  libiconv,
+  rocksdb,
+  darwin,
+  rustPlatform,
+}: let
+  crane' = crane.overrideToolchain fenix.stable.toolchain;
+in
+  crane'.buildPackage {
+    inherit src;
+    strictDeps = true;
+
+    nativeBuildInputs = [rustPlatform.bindgenHook];
+
+    buildInputs = lib.optionals stdenv.isDarwin [libiconv darwin.apple_sdk.frameworks.Security];
+
+    # Use system RocksDB
+    ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
+    ROCKSDB_LIB_DIR = "${rocksdb}/lib";
+  }