diff --git a/Cargo.toml b/Cargo.toml
index 3a6cc37..8e1a407 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "gcc"
-version = "0.1.3"
+version = "0.1.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/alexcrichton/gcc-rs"
diff --git a/src/lib.rs b/src/lib.rs
index 5ffddf9..adc9d6b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+#![allow(unstable)]
+
 use std::io::Command;
 use std::io::process::InheritFd;
 use std::default::Default;
@@ -28,7 +30,7 @@ impl Default for Config {
 fn getenv(v: &str) -> Option<String> {
     use std::os::getenv;
     let r = getenv(v);
-    println!("{:?} = {:?}", v, r);
+    println!("{} = {:?}", v, r);
     r
 }