diff --git a/Cargo.toml b/Cargo.toml
index 6c0414f9..602ac88e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "kit"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 [build-dependencies]
diff --git a/src/build/mod.rs b/src/build/mod.rs
index 364baf4e..b3c94fa0 100644
--- a/src/build/mod.rs
+++ b/src/build/mod.rs
@@ -169,7 +169,10 @@ async fn compile_python_wasm_process(process_dir: &Path, python: &str) -> anyhow
 }
 
 #[instrument(level = "trace", err, skip_all)]
-async fn compile_rust_wasm_process(process_dir: &Path) -> anyhow::Result<()> {
+async fn compile_rust_wasm_process(
+    process_dir: &Path,
+    features: &str,
+) -> anyhow::Result<()> {
     info!("Compiling Rust Kinode process in {:?}...", process_dir);
 
     // Paths
@@ -218,18 +221,23 @@ async fn compile_rust_wasm_process(process_dir: &Path) -> anyhow::Result<()> {
     File::create(bindings_dir.join("world"))?;
 
     // Build the module using Cargo
+    let mut args = vec![
+         "+nightly",
+         "build",
+         "--release",
+         "--no-default-features",
+         "--target",
+         "wasm32-wasi",
+         "--target-dir",
+         "target",
+    ];
+    if !features.is_empty() {
+        args.push("--features");
+        args.push(&features);
+    }
     run_command(
         Command::new("cargo")
-            .args(&[
-                "+nightly",
-                "build",
-                "--release",
-                "--no-default-features",
-                "--target",
-                "wasm32-wasi",
-                "--target-dir",
-                "target",
-            ])
+            .args(&args)
             .current_dir(process_dir),
     )?;
 
@@ -341,14 +349,19 @@ async fn compile_package_and_ui(
     package_dir: &Path,
     valid_node: Option<String>,
     skip_deps_check: bool,
+    features: &str,
 ) -> anyhow::Result<()> {
     compile_and_copy_ui(package_dir, valid_node).await?;
-    compile_package(package_dir, skip_deps_check).await?;
+    compile_package(package_dir, skip_deps_check, features).await?;
     Ok(())
 }
 
 #[instrument(level = "trace", err, skip_all)]
-async fn compile_package(package_dir: &Path, skip_deps_check: bool) -> anyhow::Result<()> {
+async fn compile_package(
+    package_dir: &Path,
+    skip_deps_check: bool,
+    features: &str,
+) -> anyhow::Result<()> {
     for entry in package_dir.read_dir()? {
         let entry = entry?;
         let path = entry.path();
@@ -358,7 +371,7 @@ async fn compile_package(package_dir: &Path, skip_deps_check: bool) -> anyhow::R
                     let deps = check_rust_deps()?;
                     get_deps(deps)?;
                 }
-                compile_rust_wasm_process(&path).await?;
+                compile_rust_wasm_process(&path, features).await?;
             } else if path.join(PYTHON_SRC_PATH).exists() {
                 let python = check_py_deps()?;
                 compile_python_wasm_process(&path, &python).await?;
@@ -382,6 +395,7 @@ pub async fn execute(
     no_ui: bool,
     ui_only: bool,
     skip_deps_check: bool,
+    features: &str,
 ) -> anyhow::Result<()> {
     if !package_dir.join("pkg").exists() {
         return Err(anyhow::anyhow!(
@@ -397,11 +411,11 @@ pub async fn execute(
                 "kit build: can't build UI: no ui directory exists"
             ));
         } else {
-            compile_package(package_dir, skip_deps_check).await
+            compile_package(package_dir, skip_deps_check, features).await
         }
     } else {
         if no_ui {
-            return compile_package(package_dir, skip_deps_check).await;
+            return compile_package(package_dir, skip_deps_check, features).await;
         }
 
         let deps = check_js_deps()?;
@@ -411,7 +425,12 @@ pub async fn execute(
         if ui_only {
             compile_and_copy_ui(package_dir, valid_node).await
         } else {
-            compile_package_and_ui(package_dir, valid_node, skip_deps_check).await
+            compile_package_and_ui(
+                package_dir,
+                valid_node,
+                skip_deps_check,
+                features,
+            ).await
         }
     }
 }
diff --git a/src/build_start_package/mod.rs b/src/build_start_package/mod.rs
index 8a441a86..d52ac55a 100644
--- a/src/build_start_package/mod.rs
+++ b/src/build_start_package/mod.rs
@@ -12,8 +12,9 @@ pub async fn execute(
     ui_only: bool,
     url: &str,
     skip_deps_check: bool,
+    features: &str,
 ) -> anyhow::Result<()> {
-    build::execute(package_dir, no_ui, ui_only, skip_deps_check).await?;
+    build::execute(package_dir, no_ui, ui_only, skip_deps_check, features).await?;
     start_package::execute(package_dir, url).await?;
     Ok(())
 }
diff --git a/src/main.rs b/src/main.rs
index ad38b285..b8dc5b6c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -154,8 +154,12 @@ async fn execute(
             let no_ui = build_matches.get_one::<bool>("NO_UI").unwrap();
             let ui_only = build_matches.get_one::<bool>("UI_ONLY").unwrap();
             let skip_deps_check = build_matches.get_one::<bool>("SKIP_DEPS_CHECK").unwrap();
+            let features = match build_matches.get_one::<String>("FEATURES") {
+                Some(f) => f.clone(),
+                None => "".into(),
+            };
 
-            build::execute(&package_dir, *no_ui, *ui_only, *skip_deps_check).await
+            build::execute(&package_dir, *no_ui, *ui_only, *skip_deps_check, &features).await
         },
         Some(("build-start-package", build_start_matches)) => {
 
@@ -170,6 +174,10 @@ async fn execute(
                 },
             };
             let skip_deps_check = build_start_matches.get_one::<bool>("SKIP_DEPS_CHECK").unwrap();
+            let features = match build_start_matches.get_one::<String>("FEATURES") {
+                Some(f) => f.clone(),
+                None => "".into(),
+            };
 
             build_start_package::execute(
                 &package_dir,
@@ -177,6 +185,7 @@ async fn execute(
                 *ui_only,
                 &url,
                 *skip_deps_check,
+                &features,
             ).await
         },
         Some(("dev-ui", dev_ui_matches)) => {
@@ -438,6 +447,12 @@ async fn make_app(current_dir: &std::ffi::OsString) -> anyhow::Result<Command> {
                 .help("If set, do not check for dependencies")
                 .required(false)
             )
+            .arg(Arg::new("FEATURES")
+                .action(ArgAction::Set)
+                .long("features")
+                .help("Pass these comma-delimited feature flags to Rust cargo builds")
+                .required(false)
+            )
         )
         .subcommand(Command::new("build-start-package")
             .about("Build and start a Kinode package")
@@ -481,6 +496,12 @@ async fn make_app(current_dir: &std::ffi::OsString) -> anyhow::Result<Command> {
                 .help("If set, do not check for dependencies")
                 .required(false)
             )
+            .arg(Arg::new("FEATURES")
+                .action(ArgAction::Set)
+                .long("features")
+                .help("Pass these comma-delimited feature flags to Rust cargo builds")
+                .required(false)
+            )
         )
         .subcommand(Command::new("dev-ui")
             .about("Start the web UI development server with hot reloading (same as `cd ui && npm i && npm start`)")
diff --git a/src/run_tests/mod.rs b/src/run_tests/mod.rs
index 7232b51c..c1d889bb 100644
--- a/src/run_tests/mod.rs
+++ b/src/run_tests/mod.rs
@@ -288,10 +288,10 @@ async fn run_tests(
 #[instrument(level = "trace", err, skip_all)]
 async fn handle_test(detached: bool, runtime_path: &Path, test: Test) -> anyhow::Result<()> {
     for setup_package_path in &test.setup_package_paths {
-        build::execute(&setup_package_path, false, false, false).await?;
+        build::execute(&setup_package_path, false, false, false, "").await?;
     }
     for TestPackage { ref path, .. } in &test.test_packages {
-        build::execute(path, false, false, false).await?;
+        build::execute(path, false, false, false, "").await?;
     }
 
     // Initialize variables for master node and nodes list