diff --git a/cocoa-foundation/src/foundation.rs b/cocoa-foundation/src/foundation.rs
index 6fcc2a939..760b6b0ff 100644
--- a/cocoa-foundation/src/foundation.rs
+++ b/cocoa-foundation/src/foundation.rs
@@ -10,8 +10,10 @@
 #![allow(non_upper_case_globals)]
 
 use crate::base::{id, nil, BOOL, NO, SEL};
+use bitflags::bitflags;
 use block::Block;
 use libc;
+use objc::{class, msg_send, sel, sel_impl};
 use std::os::raw::c_void;
 use std::ptr;
 
@@ -35,7 +37,7 @@ mod macos {
     use crate::base::id;
     use core_graphics_types::base::CGFloat;
     use core_graphics_types::geometry::CGRect;
-    use objc;
+    use objc::{self, class, msg_send, sel, sel_impl};
     use std::mem;
 
     #[repr(C)]
diff --git a/cocoa-foundation/src/lib.rs b/cocoa-foundation/src/lib.rs
index 7cd0350f6..cf224b5a4 100644
--- a/cocoa-foundation/src/lib.rs
+++ b/cocoa-foundation/src/lib.rs
@@ -9,14 +9,5 @@
 
 #![allow(non_snake_case)]
 
-extern crate block;
-#[macro_use]
-extern crate bitflags;
-extern crate core_foundation;
-extern crate core_graphics_types;
-extern crate libc;
-#[macro_use]
-extern crate objc;
-
 pub mod base;
 pub mod foundation;
diff --git a/cocoa-foundation/tests/foundation.rs b/cocoa-foundation/tests/foundation.rs
index f139b072a..c726cc152 100644
--- a/cocoa-foundation/tests/foundation.rs
+++ b/cocoa-foundation/tests/foundation.rs
@@ -1,8 +1,3 @@
-#[macro_use]
-extern crate objc;
-extern crate block;
-extern crate cocoa_foundation;
-
 #[cfg(test)]
 mod foundation {
     mod nsstring {
@@ -66,6 +61,7 @@ mod foundation {
     mod nsfastenumeration {
         use cocoa_foundation::base::{id, nil};
         use cocoa_foundation::foundation::{NSFastEnumeration, NSString};
+        use objc::{msg_send, sel, sel_impl};
         use std::slice;
         use std::str;
 
diff --git a/cocoa/examples/color.rs b/cocoa/examples/color.rs
index d44042689..401bdeac7 100644
--- a/cocoa/examples/color.rs
+++ b/cocoa/examples/color.rs
@@ -1,5 +1,3 @@
-extern crate cocoa;
-
 use cocoa::base::{id, nil, selector, NO};
 
 use cocoa::appkit::{
diff --git a/cocoa/examples/fullscreen.rs b/cocoa/examples/fullscreen.rs
index e3772e47b..7571e8d16 100644
--- a/cocoa/examples/fullscreen.rs
+++ b/cocoa/examples/fullscreen.rs
@@ -1,9 +1,3 @@
-extern crate cocoa;
-extern crate core_graphics;
-
-#[macro_use]
-extern crate objc;
-
 use cocoa::appkit::{
     NSApp, NSApplication, NSApplicationActivateIgnoringOtherApps,
     NSApplicationActivationPolicyRegular, NSApplicationPresentationOptions, NSBackingStoreBuffered,
@@ -19,6 +13,7 @@ use core_graphics::display::CGDisplay;
 
 use objc::declare::ClassDecl;
 use objc::runtime::{Object, Sel};
+use objc::{class, msg_send, sel, sel_impl};
 
 fn main() {
     unsafe {
diff --git a/cocoa/examples/hello_world.rs b/cocoa/examples/hello_world.rs
index 2f1f0273b..2c64a9feb 100644
--- a/cocoa/examples/hello_world.rs
+++ b/cocoa/examples/hello_world.rs
@@ -1,5 +1,3 @@
-extern crate cocoa;
-
 use cocoa::appkit::{
     NSApp, NSApplication, NSApplicationActivateIgnoringOtherApps,
     NSApplicationActivationPolicyRegular, NSBackingStoreBuffered, NSMenu, NSMenuItem,
diff --git a/cocoa/examples/nsvisualeffectview_blur.rs b/cocoa/examples/nsvisualeffectview_blur.rs
index b3fb07cdd..994b94f83 100644
--- a/cocoa/examples/nsvisualeffectview_blur.rs
+++ b/cocoa/examples/nsvisualeffectview_blur.rs
@@ -1,6 +1,3 @@
-extern crate cocoa;
-extern crate objc;
-
 use cocoa::base::{nil, selector, NO};
 use objc::*;
 
diff --git a/cocoa/examples/tab_view.rs b/cocoa/examples/tab_view.rs
index 1b0a6feb5..7e98eb746 100644
--- a/cocoa/examples/tab_view.rs
+++ b/cocoa/examples/tab_view.rs
@@ -1,5 +1,3 @@
-extern crate cocoa;
-
 use cocoa::base::{id, nil, selector, NO};
 
 use cocoa::appkit::{
diff --git a/cocoa/src/appkit.rs b/cocoa/src/appkit.rs
index 72d8da2d7..98359cb7b 100644
--- a/cocoa/src/appkit.rs
+++ b/cocoa/src/appkit.rs
@@ -13,8 +13,10 @@ use crate::base::{id, BOOL, SEL};
 use crate::foundation::{
     NSInteger, NSPoint, NSRange, NSRect, NSRectEdge, NSSize, NSTimeInterval, NSUInteger,
 };
+use bitflags::bitflags;
 use block::Block;
 use libc;
+use objc::{class, msg_send, sel, sel_impl};
 
 pub use core_graphics::base::CGFloat;
 pub use core_graphics::geometry::CGPoint;
diff --git a/cocoa/src/lib.rs b/cocoa/src/lib.rs
index 0d75b7622..1650ae111 100644
--- a/cocoa/src/lib.rs
+++ b/cocoa/src/lib.rs
@@ -11,17 +11,6 @@
 #![crate_type = "rlib"]
 #![allow(non_snake_case)]
 
-extern crate block;
-#[macro_use]
-extern crate bitflags;
-extern crate cocoa_foundation;
-extern crate core_foundation;
-extern crate core_graphics;
-extern crate foreign_types;
-extern crate libc;
-#[macro_use]
-extern crate objc;
-
 #[cfg(target_os = "macos")]
 pub mod appkit;
 pub mod base;
diff --git a/cocoa/src/macros.rs b/cocoa/src/macros.rs
index 264bead5e..7063da85e 100644
--- a/cocoa/src/macros.rs
+++ b/cocoa/src/macros.rs
@@ -12,13 +12,12 @@
 ///
 /// # Example with `NSWindowDelegate`
 /// ``` no_run
-/// #[macro_use] extern crate cocoa;
-/// #[macro_use] extern crate objc;
-///
 /// use cocoa::appkit::NSWindow;
 /// use cocoa::base::{id, nil};
+/// use cocoa::delegate;
 ///
 /// use objc::runtime::{Object, Sel};
+/// use objc::{msg_send, sel, sel_impl};
 ///
 /// # fn main() {
 /// unsafe {
@@ -57,7 +56,7 @@ macro_rules! delegate {
             $( ($($sel:ident :)+) => $func:expr),*
         }
     ) => ({
-        let mut decl = objc::declare::ClassDecl::new($name, class!(NSObject)).unwrap();
+        let mut decl = objc::declare::ClassDecl::new($name, objc::class!(NSObject)).unwrap();
 
         $(
             decl.add_ivar::<$var_type>(stringify!($var));
diff --git a/cocoa/src/quartzcore.rs b/cocoa/src/quartzcore.rs
index 5d7bb9314..649384dc5 100644
--- a/cocoa/src/quartzcore.rs
+++ b/cocoa/src/quartzcore.rs
@@ -9,6 +9,7 @@
 
 #![allow(non_upper_case_globals)]
 
+use bitflags::bitflags;
 use core_foundation::array::{CFArray, CFArrayRef};
 use core_foundation::base::{CFType, CFTypeRef, TCFType};
 use core_foundation::date::CFTimeInterval;
@@ -21,6 +22,7 @@ use core_graphics::context::CGContext;
 use core_graphics::geometry::{CGAffineTransform, CGPoint, CGRect, CGSize};
 use core_graphics::path::{CGPath, SysCGPathRef};
 use foreign_types::ForeignType;
+use objc::{class, msg_send, sel, sel_impl};
 use std::ops::Mul;
 use std::ptr;
 
@@ -1358,6 +1360,7 @@ pub mod transaction {
     use block::{Block, ConcreteBlock, IntoConcreteBlock, RcBlock};
     use core_foundation::date::CFTimeInterval;
     use core_foundation::string::CFString;
+    use objc::{class, msg_send, sel, sel_impl};
 
     use crate::base::{id, BOOL, YES};
 
diff --git a/core-foundation/src/filedescriptor.rs b/core-foundation/src/filedescriptor.rs
index 876d1cec0..e3fc61be9 100644
--- a/core-foundation/src/filedescriptor.rs
+++ b/core-foundation/src/filedescriptor.rs
@@ -97,8 +97,6 @@ impl AsRawFd for CFFileDescriptor {
 
 #[cfg(test)]
 mod test {
-    extern crate libc;
-
     use super::*;
     use crate::runloop::CFRunLoop;
     use core_foundation_sys::base::CFOptionFlags;
diff --git a/core-foundation/src/lib.rs b/core-foundation/src/lib.rs
index 767d45aad..c58b1098e 100644
--- a/core-foundation/src/lib.rs
+++ b/core-foundation/src/lib.rs
@@ -15,12 +15,6 @@
 //! It also provides a framework for other crates to use when wrapping
 //! other frameworks that use the CoreFoundation framework.
 
-extern crate core_foundation_sys;
-extern crate libc;
-
-#[cfg(feature = "with-chrono")]
-extern crate chrono;
-
 use crate::base::TCFType;
 
 pub unsafe trait ConcreteCFType: TCFType {}
@@ -32,7 +26,7 @@ pub unsafe trait ConcreteCFType: TCFType {}
 /// provided using the [`impl_TCFType`] macro.
 ///
 /// ```
-/// #[macro_use] extern crate core_foundation;
+/// use core_foundation::{declare_TCFType, impl_TCFType};
 /// // Make sure that the `TCFType` trait is in scope.
 /// use core_foundation::base::{CFTypeID, TCFType};
 ///
diff --git a/core-foundation/src/uuid.rs b/core-foundation/src/uuid.rs
index f5146c54e..3ac1cc111 100644
--- a/core-foundation/src/uuid.rs
+++ b/core-foundation/src/uuid.rs
@@ -9,16 +9,13 @@
 
 //! Core Foundation UUID objects.
 
-#[cfg(feature = "with-uuid")]
-extern crate uuid;
-
 use core_foundation_sys::base::kCFAllocatorDefault;
 pub use core_foundation_sys::uuid::*;
 
 use crate::base::TCFType;
 
 #[cfg(feature = "with-uuid")]
-use self::uuid::Uuid;
+use uuid::Uuid;
 
 declare_TCFType! {
     /// A UUID.
diff --git a/core-foundation/tests/use_macro_outside_crate.rs b/core-foundation/tests/use_macro_outside_crate.rs
index ff1c17d4c..b60b9d0ee 100644
--- a/core-foundation/tests/use_macro_outside_crate.rs
+++ b/core-foundation/tests/use_macro_outside_crate.rs
@@ -1,7 +1,5 @@
-#[macro_use]
-extern crate core_foundation;
-
 use core_foundation::base::{CFComparisonResult, TCFType};
+use core_foundation::{declare_TCFType, impl_CFComparison, impl_CFTypeDescription, impl_TCFType};
 use std::os::raw::c_void;
 
 // sys equivalent stuff that must be declared
diff --git a/core-graphics-types/src/lib.rs b/core-graphics-types/src/lib.rs
index 94a4eb979..d9ca4ee22 100644
--- a/core-graphics-types/src/lib.rs
+++ b/core-graphics-types/src/lib.rs
@@ -7,8 +7,5 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate core_foundation;
-extern crate libc;
-
 pub mod base;
 pub mod geometry;
diff --git a/core-graphics/src/color.rs b/core-graphics/src/color.rs
index f19a345a9..dbace27a0 100644
--- a/core-graphics/src/color.rs
+++ b/core-graphics/src/color.rs
@@ -11,6 +11,7 @@ use super::sys::CGColorRef;
 use crate::base::CGFloat;
 use core_foundation::base::CFTypeID;
 use core_foundation::base::TCFType;
+use core_foundation::{declare_TCFType, impl_TCFType};
 
 pub use super::sys::CGColorRef as SysCGColorRef;
 
diff --git a/core-graphics/src/color_space.rs b/core-graphics/src/color_space.rs
index 49ac5dc81..47b1ec087 100644
--- a/core-graphics/src/color_space.rs
+++ b/core-graphics/src/color_space.rs
@@ -9,7 +9,7 @@
 
 use core_foundation::base::{CFRelease, CFRetain, CFTypeID};
 use core_foundation::string::CFStringRef;
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 
 foreign_type! {
     #[doc(hidden)]
diff --git a/core-graphics/src/context.rs b/core-graphics/src/context.rs
index 9149fec73..db36b5af0 100644
--- a/core-graphics/src/context.rs
+++ b/core-graphics/src/context.rs
@@ -20,7 +20,7 @@ use std::os::raw::c_void;
 
 use crate::geometry::{CGAffineTransform, CGRect};
 use crate::image::CGImage;
-use foreign_types::{ForeignType, ForeignTypeRef};
+use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
 use std::cmp;
 use std::ptr;
 use std::slice;
diff --git a/core-graphics/src/data_provider.rs b/core-graphics/src/data_provider.rs
index 6002659c3..80f092823 100644
--- a/core-graphics/src/data_provider.rs
+++ b/core-graphics/src/data_provider.rs
@@ -16,7 +16,7 @@ use std::os::raw::c_void;
 use std::ptr;
 use std::sync::Arc;
 
-use foreign_types::{ForeignType, ForeignTypeRef};
+use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
 
 pub type CGDataProviderGetBytesCallback =
     Option<unsafe extern "C" fn(*mut c_void, *mut c_void, size_t) -> size_t>;
diff --git a/core-graphics/src/display.rs b/core-graphics/src/display.rs
index d2f450f2d..9592dc497 100644
--- a/core-graphics/src/display.rs
+++ b/core-graphics/src/display.rs
@@ -19,7 +19,7 @@ pub use crate::geometry::{CGPoint, CGRect, CGSize};
 use crate::image::CGImage;
 use core_foundation::base::{CFRetain, TCFType};
 use core_foundation::string::{CFString, CFStringRef};
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 
 pub type CGDirectDisplayID = u32;
 pub type CGWindowID = u32;
diff --git a/core-graphics/src/event.rs b/core-graphics/src/event.rs
index 02024de39..c96961826 100644
--- a/core-graphics/src/event.rs
+++ b/core-graphics/src/event.rs
@@ -1,11 +1,13 @@
 #![allow(non_upper_case_globals)]
 use crate::event_source::CGEventSource;
 use crate::geometry::CGPoint;
+
+use bitflags::bitflags;
 use core_foundation::{
     base::{CFRelease, CFRetain, CFTypeID, TCFType},
     mach_port::{CFMachPort, CFMachPortRef},
 };
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 use libc::c_void;
 use std::mem::ManuallyDrop;
 
@@ -441,7 +443,6 @@ unsafe extern "C" fn cg_event_tap_callback_internal(
 }
 
 /// ```no_run
-///extern crate core_foundation;
 ///use core_foundation::runloop::{kCFRunLoopCommonModes, CFRunLoop};
 ///use core_graphics::event::{CGEventTap, CGEventTapLocation, CGEventTapPlacement, CGEventTapOptions, CGEventType};
 ///let current = CFRunLoop::get_current();
diff --git a/core-graphics/src/event_source.rs b/core-graphics/src/event_source.rs
index 7ac2c5a23..ed3c65418 100644
--- a/core-graphics/src/event_source.rs
+++ b/core-graphics/src/event_source.rs
@@ -1,5 +1,5 @@
 use core_foundation::base::{CFRelease, CFRetain, CFTypeID};
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 
 /// Possible source states of an event source.
 #[repr(C)]
diff --git a/core-graphics/src/font.rs b/core-graphics/src/font.rs
index 7e0287740..7cd9b9cc3 100644
--- a/core-graphics/src/font.rs
+++ b/core-graphics/src/font.rs
@@ -17,7 +17,7 @@ use core_foundation::number::CFNumber;
 use core_foundation::string::{CFString, CFStringRef};
 use std::ptr::NonNull;
 
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 
 use libc::{c_int, size_t};
 
diff --git a/core-graphics/src/gradient.rs b/core-graphics/src/gradient.rs
index a70fa194f..854bdb0ae 100644
--- a/core-graphics/src/gradient.rs
+++ b/core-graphics/src/gradient.rs
@@ -13,9 +13,10 @@ use crate::base::CGFloat;
 use crate::color::CGColor;
 use crate::color_space::CGColorSpace;
 
+use bitflags::bitflags;
 use core_foundation::array::{CFArray, CFArrayRef};
 use core_foundation::base::{CFRelease, CFRetain, TCFType};
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 
 use libc::size_t;
 
diff --git a/core-graphics/src/image.rs b/core-graphics/src/image.rs
index e684ffb2a..9aca0cbc0 100644
--- a/core-graphics/src/image.rs
+++ b/core-graphics/src/image.rs
@@ -6,7 +6,7 @@ use crate::data_provider::{CGDataProvider, CGDataProviderRef};
 use crate::geometry::CGRect;
 use core_foundation::base::{CFRetain, CFTypeID};
 use core_foundation::data::CFData;
-use foreign_types::{ForeignType, ForeignTypeRef};
+use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
 use libc::size_t;
 
 #[repr(C)]
diff --git a/core-graphics/src/lib.rs b/core-graphics/src/lib.rs
index 3c1b6443a..0d545d01b 100644
--- a/core-graphics/src/lib.rs
+++ b/core-graphics/src/lib.rs
@@ -7,19 +7,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate libc;
-
-#[macro_use]
-extern crate core_foundation;
-
-#[macro_use]
-extern crate bitflags;
-
-#[macro_use]
-extern crate foreign_types;
-
-extern crate core_graphics_types;
-
 #[cfg(target_os = "macos")]
 pub mod access;
 pub mod base;
diff --git a/core-graphics/src/path.rs b/core-graphics/src/path.rs
index 78c2653ba..9a33284c3 100644
--- a/core-graphics/src/path.rs
+++ b/core-graphics/src/path.rs
@@ -11,7 +11,7 @@ pub use crate::sys::CGPathRef as SysCGPathRef;
 
 use crate::geometry::{CGAffineTransform, CGPoint, CGRect};
 use core_foundation::base::{CFRelease, CFRetain, CFTypeID};
-use foreign_types::ForeignType;
+use foreign_types::{foreign_type, ForeignType};
 use libc::c_void;
 use std::fmt::{self, Debug, Formatter};
 use std::marker::PhantomData;
diff --git a/core-text/src/font.rs b/core-text/src/font.rs
index efe9e321b..cf28ca548 100644
--- a/core-text/src/font.rs
+++ b/core-text/src/font.rs
@@ -23,6 +23,7 @@ use core_foundation::dictionary::{CFDictionary, CFDictionaryRef};
 use core_foundation::number::CFNumber;
 use core_foundation::string::{CFString, CFStringRef, UniChar};
 use core_foundation::url::{CFURLRef, CFURL};
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::base::CGFloat;
 use core_graphics::context::CGContext;
 use core_graphics::font::{CGFont, CGGlyph};
diff --git a/core-text/src/font_collection.rs b/core-text/src/font_collection.rs
index 5745721c6..824e6665e 100644
--- a/core-text/src/font_collection.rs
+++ b/core-text/src/font_collection.rs
@@ -19,6 +19,7 @@ use core_foundation::dictionary::{CFDictionary, CFDictionaryRef};
 use core_foundation::number::CFNumber;
 use core_foundation::set::CFSet;
 use core_foundation::string::{CFString, CFStringRef};
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 
 use std::os::raw::c_void;
 
diff --git a/core-text/src/font_descriptor.rs b/core-text/src/font_descriptor.rs
index e5506d216..b0006a5fd 100644
--- a/core-text/src/font_descriptor.rs
+++ b/core-text/src/font_descriptor.rs
@@ -16,6 +16,7 @@ use core_foundation::number::{CFNumber, CFNumberRef};
 use core_foundation::set::CFSetRef;
 use core_foundation::string::{CFString, CFStringRef};
 use core_foundation::url::{CFURLRef, CFURL};
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::base::CGFloat;
 
 use std::os::raw::c_void;
diff --git a/core-text/src/frame.rs b/core-text/src/frame.rs
index eebaaa1d0..09687f639 100644
--- a/core-text/src/frame.rs
+++ b/core-text/src/frame.rs
@@ -10,6 +10,7 @@
 use crate::line::CTLine;
 use core_foundation::array::{CFArray, CFArrayRef};
 use core_foundation::base::{CFRange, CFTypeID, TCFType};
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::context::{CGContext, CGContextRef};
 use core_graphics::geometry::CGPoint;
 use core_graphics::path::{CGPath, SysCGPathRef};
diff --git a/core-text/src/framesetter.rs b/core-text/src/framesetter.rs
index abdd3eb37..ac83a319f 100644
--- a/core-text/src/framesetter.rs
+++ b/core-text/src/framesetter.rs
@@ -11,6 +11,7 @@ use super::frame::{CTFrame, CTFrameRef};
 use core_foundation::attributed_string::CFAttributedStringRef;
 use core_foundation::base::{CFRange, CFTypeID, TCFType};
 use core_foundation::dictionary::CFDictionaryRef;
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::geometry::CGSize;
 use core_graphics::path::{CGPath, CGPathRef};
 use foreign_types::{ForeignType, ForeignTypeRef};
diff --git a/core-text/src/lib.rs b/core-text/src/lib.rs
index be394b020..8311c8b38 100644
--- a/core-text/src/lib.rs
+++ b/core-text/src/lib.rs
@@ -16,13 +16,6 @@ Many of these functions will add objects to the autorelease pool.
 If you don't have one this will cause leaks.
 */
 
-extern crate foreign_types;
-extern crate libc;
-
-#[macro_use]
-extern crate core_foundation;
-extern crate core_graphics;
-
 pub mod font;
 pub mod font_collection;
 pub mod font_descriptor;
diff --git a/core-text/src/line.rs b/core-text/src/line.rs
index 09d34fd35..c250924f5 100644
--- a/core-text/src/line.rs
+++ b/core-text/src/line.rs
@@ -11,6 +11,7 @@ use crate::run::CTRun;
 use core_foundation::array::{CFArray, CFArrayRef};
 use core_foundation::attributed_string::CFAttributedStringRef;
 use core_foundation::base::{CFIndex, CFRange, CFTypeID, TCFType};
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::base::CGFloat;
 use core_graphics::context::CGContext;
 use core_graphics::geometry::{CGPoint, CGRect};
diff --git a/core-text/src/run.rs b/core-text/src/run.rs
index e03065a1f..c20db2a1d 100644
--- a/core-text/src/run.rs
+++ b/core-text/src/run.rs
@@ -10,6 +10,7 @@
 use core_foundation::base::{CFIndex, CFRange, CFType, CFTypeID, TCFType};
 use core_foundation::dictionary::{CFDictionary, CFDictionaryRef};
 use core_foundation::string::CFString;
+use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::font::CGGlyph;
 use core_graphics::geometry::CGPoint;
 use std::borrow::Cow;
diff --git a/io-surface/src/lib.rs b/io-surface/src/lib.rs
index 184655beb..7dad15981 100644
--- a/io-surface/src/lib.rs
+++ b/io-surface/src/lib.rs
@@ -10,12 +10,6 @@
 #![crate_name = "io_surface"]
 #![crate_type = "rlib"]
 
-extern crate cgl;
-extern crate core_foundation;
-extern crate core_foundation_sys;
-extern crate leaky_cow;
-extern crate libc;
-
 // Rust bindings to the IOSurface framework on macOS.
 
 use cgl::{kCGLNoError, CGLErrorString, CGLGetCurrentContext, CGLTexImageIOSurface2D, GLenum};