diff --git a/Cargo.toml b/Cargo.toml
index bf166a8..7402326 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,4 +8,7 @@ documentation = "http://bsago.me/doc/users/"
 homepage = "https://github.com/ogham/rust-users"
 license = "MIT"
 readme = "README.md"
-version = "0.2.2"
+version = "0.2.3"
+
+[dependencies]
+libc = "0.1.1"
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index ba0552c..925d5ad 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,8 @@
 #![crate_name = "users"]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
-#![feature(collections, core, libc, std_misc)]
+#![allow(unused_features)]
+#![feature(core, libc, std_misc)]
 
 //! This is a library for getting information on Unix users and groups.
 //!