diff --git a/Cargo.toml b/Cargo.toml
index 8981b35..54ac2c5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,8 @@ name = "quinoa"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[features]
+server = ["dep:pam-client", "dep:pam-client-macos"]
 
 [dependencies]
 anyhow = "1.0.71"
@@ -30,7 +31,7 @@ tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
 triggered = "0.1.2"
 
 [target.'cfg(not(target_os = "macos"))'.dependencies]
-pam-client = { version = "0.5.0", default-features = false, features = ["serde"] }
+pam-client = { version = "0.5.0", default-features = false, features = ["serde"], optional = true }
 
 [target.'cfg(target_os = "macos")'.dependencies]
-pam-client-macos = { package = "pam-client", version = "0.5.0", path = "../../../../../Users/michael/b/rust-pam-client", default-features = false, features = ["serde"] }
+pam-client-macos = { package = "pam-client", version = "0.5.0", path = "../../../../../Users/michael/b/rust-pam-client", default-features = false, features = ["serde"], optional = true }
diff --git a/src/main.rs b/src/main.rs
index 82ecde3..45f0806 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,7 +12,7 @@ mod pty;
 mod terminfo;
 mod user_info;
 
-#[cfg(target_os = "macos")]
+#[cfg(all(feature = "server", target_os = "macos"))]
 use pam_client_macos as pam_client;
 
 use std::ffi::{CStr, CString};
@@ -31,6 +31,7 @@ use std::task::Poll;
 use anyhow::{Context, Result};
 use base64::Engine as _;
 use nix::unistd::{Gid, Uid};
+#[cfg(feature = "server")]
 use pam_client::ConversationHandler;
 use quinn::{ReadExactError, RecvStream, SendStream};
 use rustls::client::ServerCertVerifier;
@@ -102,6 +103,7 @@ async fn main() -> Result<()> {
 async fn run_cmd(mut args: std::env::Args) -> Result<()> {
     let cmd = args.next().expect("COMMAND");
     match cmd.as_str() {
+        #[cfg(feature = "server")]
         "server" => run_server().await,
         "client" => run_client(args).await,
         _ => Err(anyhow!("Unrecognized command: {}", cmd)),
@@ -119,6 +121,7 @@ struct ClientConfig {
     known_hosts: parking_lot::Mutex<Vec<KnownHost<'static>>>,
 }
 
+#[cfg(feature = "server")]
 async fn run_server() -> Result<()> {
     let cfg = {
         let opt_listen = std::env::var("BIND_ADDR")
@@ -734,7 +737,7 @@ async fn do_auth_prompt(
                         stdout.write_all(&prompt).await?;
                         let answer = rpassword::read_password()?;
                         let answer = CString::new(answer)?;
-                        write_msg(send, &Answer::Prompt(Ok(answer))).await?;
+                        write_msg(send, &Answer::Prompt(answer)).await?;
                     },
                     Question::TextInfo(s) => {
                         stdout.write_all(b"INFO ").await?;
@@ -765,6 +768,7 @@ async fn do_auth_prompt(
     }
 }
 
+#[cfg(feature = "server")]
 async fn greet_conn(cfg: &'static ServerConfig, conn: quinn::Connecting) -> Result<()> {
     info!("greeting connection");
 
@@ -789,8 +793,6 @@ async fn greet_conn(cfg: &'static ServerConfig, conn: quinn::Connecting) -> Resu
 }
 
 mod auth {
-    use super::pam_client;
-
     use std::ffi::CString;
 
     #[derive(Debug, Serialize, Deserialize)]
@@ -808,10 +810,11 @@ mod auth {
 
     #[derive(Debug, Serialize, Deserialize)]
     pub enum Answer {
-        Prompt(Result<CString, pam_client::ErrorCode>),
+        Prompt(CString),
     }
 }
 
+#[cfg(feature = "server")]
 async fn authenticate_conn(cfg: &'static ServerConfig, conn: &quinn::Connection) -> Result<()> {
     use auth::*;
 
@@ -855,7 +858,7 @@ async fn authenticate_conn(cfg: &'static ServerConfig, conn: &quinn::Connection)
                 echo: true,
             })?;
             match self.answer()? {
-                Answer::Prompt(r) => r,
+                Answer::Prompt(s) => Ok(s),
             }
         }
 
@@ -868,7 +871,7 @@ async fn authenticate_conn(cfg: &'static ServerConfig, conn: &quinn::Connection)
                 echo: false,
             })?;
             match self.answer()? {
-                Answer::Prompt(r) => r,
+                Answer::Prompt(s) => Ok(s),
             }
         }
 
@@ -1022,6 +1025,7 @@ async fn authenticate_conn(cfg: &'static ServerConfig, conn: &quinn::Connection)
         .await
 }
 
+#[cfg(feature = "server")]
 async fn handle_conn(
     cfg: &'static ServerConfig,
     conn: &quinn::Connection,