diff --git a/base.rs b/base.rs
index 90a495e..5e1a6c7 100644
--- a/base.rs
+++ b/base.rs
@@ -9,6 +9,8 @@
 
 // this file defines CGFloat, as well as stubbed data types.
 
+use std::libc;
+
 // TODO: this is actually a libc::c_float on 32bit
 pub type CGFloat = libc::c_double;
 
diff --git a/data_provider.rs b/data_provider.rs
index 80cb092..c96dd0d 100644
--- a/data_provider.rs
+++ b/data_provider.rs
@@ -9,7 +9,9 @@
 
 use core_foundation::base::{AbstractCFTypeRef, CFTypeID, CFTypeRef, CFWrapper};
 
-use core::libc::{c_void, c_char, size_t};
+use std::cast;
+use std::libc::{c_void, c_char, size_t};
+use std::ptr;
 
 pub type CGDataProviderGetBytesCallback = *u8;
 pub type CGDataProviderReleaseInfoCallback = *u8;
diff --git a/font.rs b/font.rs
index 60e2deb..994ceee 100644
--- a/font.rs
+++ b/font.rs
@@ -10,6 +10,7 @@
 use core_foundation::base::{AbstractCFTypeRef, CFTypeID, CFTypeRef, CFWrapper};
 
 use data_provider::{CGDataProvider, CGDataProviderRef};
+use std::libc;
 
 pub type CGGlyph = libc::c_ushort;