diff --git a/sdl2-sys/build.rs b/sdl2-sys/build.rs
index e521f5b0..46531d30 100644
--- a/sdl2-sys/build.rs
+++ b/sdl2-sys/build.rs
@@ -1,3 +1,5 @@
+#![feature(os)]
+
 extern crate "pkg-config" as pkg_config;
 
 fn main() {
diff --git a/sdl2-sys/src/lib.rs b/sdl2-sys/src/lib.rs
index 2a9a181c..4a0e5546 100644
--- a/sdl2-sys/src/lib.rs
+++ b/sdl2-sys/src/lib.rs
@@ -1,5 +1,7 @@
 #![allow(non_camel_case_types)]
 
+#![feature(core, libc)]
+
 extern crate libc;
 
 pub mod scancode;
diff --git a/sdl2-sys/src/rect.rs b/sdl2-sys/src/rect.rs
index 7fa74cd0..e26955e8 100644
--- a/sdl2-sys/src/rect.rs
+++ b/sdl2-sys/src/rect.rs
@@ -6,7 +6,7 @@ use std::mem;
 use libc::c_int;
 
 /// A structure that defines a two dimensional point.
-#[derive(PartialEq, Clone, Show, Copy)]
+#[derive(PartialEq, Clone, Debug, Copy)]
 #[repr(C)]
 pub struct Point {
     pub x: i32,
@@ -14,7 +14,7 @@ pub struct Point {
 }
 
 /// A structure that defines a rectangle, with the origin at the upper left.
-#[derive(PartialEq, Clone, Show, Copy)]
+#[derive(PartialEq, Clone, Debug, Copy)]
 #[repr(C)]
 pub struct Rect {
     pub x: i32,
diff --git a/src/sdl2/gesture.rs b/src/sdl2/gesture.rs
index 2088940d..bf7c7e44 100644
--- a/src/sdl2/gesture.rs
+++ b/src/sdl2/gesture.rs
@@ -1 +1,2 @@
+#[allow(unused)]
 use sys::gesture as ll;
diff --git a/src/sdl2/haptic.rs b/src/sdl2/haptic.rs
index 9e15878f..e72ed7bd 100644
--- a/src/sdl2/haptic.rs
+++ b/src/sdl2/haptic.rs
@@ -1,2 +1,3 @@
 //! Haptic Functions
+#[allow(unused)]
 use sys::haptic as ll;