diff --git a/appkit.rs b/appkit.rs
index 8a983a7..03a3705 100644
--- a/appkit.rs
+++ b/appkit.rs
@@ -8,6 +8,7 @@
 // except according to those terms.
 
 use base;
+use std::str;
 
 pub type CGFloat = f32;
 
@@ -46,14 +47,14 @@ pub struct NSRect {
 
 #[nolink]
 #[link_args="-framework AppKit"]
-pub extern mod appkit {
+extern {
     fn NSBeep();
 }
 
 pub fn NSApp() -> base::id {
     unsafe {
-        let klass = str::as_c_str(~"NSApplication", |s| base::objc_getClass(s));
-        let sel = str::as_c_str(~"sharedApplication", |s| base::sel_registerName(s));
+        let klass = str::as_c_str("NSApplication", |s| base::objc_getClass(s));
+        let sel = str::as_c_str("sharedApplication", |s| base::sel_registerName(s));
         base::objc_msgSend(klass, sel)
     }
 }
diff --git a/base.rs b/base.rs
index dab80fb..e14b94a 100644
--- a/base.rs
+++ b/base.rs
@@ -9,7 +9,10 @@
 
 use appkit::NSRect;
 
-use core::libc::c_long;
+use std::libc;
+use std::libc::c_long;
+use std::io;
+use std::str;
 
 pub type id = libc::intptr_t;
 pub type Class = libc::intptr_t;
diff --git a/foundation.rs b/foundation.rs
index b064484..d4344ce 100644
--- a/foundation.rs
+++ b/foundation.rs
@@ -8,10 +8,11 @@
 // except according to those terms.
 
 use base;
+use std::str;
 
 #[nolink]
 #[link_args="-framework Foundation"]
-extern mod foundation {
+extern {
 }
 
 enum NSAutoreleasePool {
@@ -20,12 +21,12 @@ enum NSAutoreleasePool {
 
 fn NSAutoreleasePool() -> base::id {
     unsafe {
-        let klass = str::as_c_str(~"NSAutoreleasePool", |s|
+        let klass = str::as_c_str("NSAutoreleasePool", |s|
             base::objc_getClass(s)
         );
 
-        let alloc_sel = str::as_c_str(~"alloc", |s| base::sel_registerName(s));
-        let init_sel = str::as_c_str(~"init", |s| base::sel_registerName(s));
+        let alloc_sel = str::as_c_str("alloc", |s| base::sel_registerName(s));
+        let init_sel = str::as_c_str("init", |s| base::sel_registerName(s));
 
         let pool = base::objc_msgSend(klass, alloc_sel);
         base::objc_msgSend(pool, init_sel)