diff --git a/V2/sleep/src/lib.rs b/V2/sleep/src/lib.rs
index 8d0c260..143e7a5 100644
--- a/V2/sleep/src/lib.rs
+++ b/V2/sleep/src/lib.rs
@@ -2,8 +2,6 @@ extern crate libc;
 
 use std::time::Duration;
 
-const CLOCK_MONOTONIC: i32 = 1;
-
 #[cfg(target_os = "linux")]
 fn clock_nanosleep(clk_id: libc::clockid_t,
                    flags: libc::c_int,
@@ -14,11 +12,7 @@ fn clock_nanosleep(clk_id: libc::clockid_t,
 }
 
 #[cfg(target_os = "macos")]
-fn clock_nanosleep(_clk_id: libc::c_int,
-                   _flags: libc::c_int,
-                   rqtp: *const libc::timespec,
-                   rmtp: *mut libc::timespec)
-                   -> libc::c_int {
+fn nanosleep(rqtp: *const libc::timespec, rmtp: *mut libc::timespec) -> libc::c_int {
     unsafe { libc::nanosleep(rqtp as *const _, rmtp as *mut _) }
 }
 
@@ -31,7 +25,12 @@ pub fn sleep(duration: Duration) -> Result<Duration, libc::c_int> {
         tv_sec: 0,
         tv_nsec: 0,
     };
-    let ret = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &mut remain);
+
+    #[cfg(target_os = "linux")]
+    let ret = clock_nanosleep(libc::CLOCK_MONOTONIC, 0, &ts, &mut remain);
+
+    #[cfg(target_os = "macos")]
+    let ret = nanosleep(&ts, &mut remain);
 
     if ret == 0 {
         Ok(timespec_to_duration(remain))
diff --git a/V2/sleep/src/main.rs b/V2/sleep/src/main.rs
index 1e6b4d6..391348a 100644
--- a/V2/sleep/src/main.rs
+++ b/V2/sleep/src/main.rs
@@ -8,10 +8,16 @@ use std::fs::File;
 use std::path::Path;
 use std::time::Duration;
 
-use argparse::{ArgumentParser, Print, Store, StoreTrue};
-use sleep::{set_priority, sleep};
+use argparse::{ArgumentParser, Print, Store};
+use sleep::sleep;
 use time::precise_time_ns;
 
+#[cfg(target_os = "linux")]
+use argparse::StoreTrue;
+
+#[cfg(target_os = "linux")]
+use sleep::set_priority;
+
 fn duration_from_ns(duration_ns: u64) -> Duration {
     Duration::new(duration_ns / 1_000_000_000,
                   (duration_ns % 1_000_000_000) as u32)
@@ -22,11 +28,11 @@ fn duration_to_ns(duration: Duration) -> u64 {
 
 fn measure_duration(sleep_duration: Duration) -> Duration {
     let start = precise_time_ns();
-    let remain = sleep(sleep_duration);
+    let _remain = sleep(sleep_duration);
     let end = precise_time_ns();
 
     #[cfg(debug_assertions)]
-    println!("remain = {:?}", remain);
+    println!("remain = {:?}", _remain);
 
     let duration = end - start;
     let duration = duration_from_ns(duration);
@@ -80,10 +86,15 @@ fn main() {
     let mut max: u64 = 100_000_000;
     let mut step: u64 = 1_000_000;
     let mut count: u64 = 100;
-    let mut realtime: bool = false;
     let mut output: String = "".to_string();
     let mut file: Option<File> = None;
 
+    #[cfg(target_os = "linux")]
+    let mut realtime: bool = false;
+
+    #[cfg(target_os = "macos")]
+    let realtime: bool = false;
+
     {
         let mut ap = ArgumentParser::new();
         ap.set_description(env!("CARGO_PKG_DESCRIPTION"));
@@ -91,6 +102,7 @@ fn main() {
         ap.refer(&mut max).add_option(&["--max"], Store, "Sleep period end");
         ap.refer(&mut step).add_option(&["--step"], Store, "Sleep period step size");
         ap.refer(&mut count).add_option(&["--loop"], Store, "Count of measurements per period");
+        #[cfg(target_os = "linux")]
         ap.refer(&mut realtime).add_option(&["--rt"], StoreTrue, "Output file");
         ap.refer(&mut output).add_option(&["-o", "--out"], Store, "Output file");
         ap.add_option(&["-V", "--version"],
@@ -100,8 +112,12 @@ fn main() {
     }
 
     if realtime {
+        #[cfg(target_os = "linux")]
         let ret = set_priority(99);
 
+        #[cfg(target_os = "macos")]
+        let ret = 0;
+
         if ret != 0 {
             panic!("Set realtime priority failed.");
         }