diff --git a/objc/src/runtime.rs b/objc/src/runtime.rs
index bb3367197..36509a217 100644
--- a/objc/src/runtime.rs
+++ b/objc/src/runtime.rs
@@ -14,6 +14,7 @@ use std::os::raw::c_uint;
 use crate::Encode;
 
 use objc_sys;
+#[cfg(target_vendor = "apple")]
 #[allow(deprecated)]
 pub use objc_sys::object_dispose;
 pub use objc_sys::{
diff --git a/objc_sys/src/constants.rs b/objc_sys/src/constants.rs
index fad034c11..bf2e713c3 100644
--- a/objc_sys/src/constants.rs
+++ b/objc_sys/src/constants.rs
@@ -1,8 +1,9 @@
 //! Various common #defines and enum constants.
 
+#[cfg(apple)]
 use std::os::raw::c_int;
 
-use super::{id, Class, BOOL};
+use crate::{id, Class, BOOL};
 
 /// The equivalent of true for Objective-C's [`BOOL`][`super::BOOL`] type.
 #[cfg(not(target_arch = "aarch64"))]
diff --git a/objc_sys/src/exception.rs b/objc_sys/src/exception.rs
index 3c58eff14..49f9b7379 100644
--- a/objc_sys/src/exception.rs
+++ b/objc_sys/src/exception.rs
@@ -3,9 +3,12 @@
 //! GNUStep: `eh_personality.c`, which is a bit brittle to rely on, but I
 //!   think it's fine...
 use core::ffi::c_void;
+#[cfg(any(apple, gnustep))]
 use std::os::raw::c_int;
 
-use crate::{objc_class, objc_object};
+#[cfg(apple)]
+use crate::objc_class;
+use crate::objc_object;
 
 /// Remember that this is non-null!
 #[cfg(apple)]
diff --git a/objc_sys/src/message.rs b/objc_sys/src/message.rs
index f93429b19..8f1b1ef0a 100644
--- a/objc_sys/src/message.rs
+++ b/objc_sys/src/message.rs
@@ -3,7 +3,9 @@
 //! Most of these are `cfg`-gated, these configs are semver-stable.
 //!
 //! TODO: Some of these are only supported on _some_ GNUStep targets!
-use super::{objc_class, objc_object};
+use crate::{objc_class, objc_object};
+#[cfg(gnustep)]
+use crate::{objc_selector, IMP};
 
 /// Specifies data used when sending messages to superclasses.
 #[repr(C)]
@@ -21,7 +23,7 @@ pub struct objc_super {
 #[cfg(gnustep)]
 extern "C" {
     pub fn objc_msg_lookup(receiver: *mut objc_object, sel: *const objc_selector) -> IMP;
-    pub fn objc_msg_lookup_super(super: *const objc_super, sel: *const objc_selector) -> IMP;
+    pub fn objc_msg_lookup_super(sup: *const objc_super, sel: *const objc_selector) -> IMP;
     // objc_msg_lookup_sender
 }
 
diff --git a/objc_sys/src/various.rs b/objc_sys/src/various.rs
index 6d0cb1fe4..460a1974a 100644
--- a/objc_sys/src/various.rs
+++ b/objc_sys/src/various.rs
@@ -1,7 +1,11 @@
 use core::ffi::c_void;
-use std::os::raw::{c_char, c_int, c_uint};
+use std::os::raw::c_char;
+#[cfg(apple)]
+use std::os::raw::{c_int, c_uint};
 
-use crate::{objc_AssociationPolicy, objc_class, objc_object, OpaqueData, BOOL};
+#[cfg(apple)]
+use crate::objc_class;
+use crate::{objc_AssociationPolicy, objc_object, OpaqueData, BOOL};
 
 /// A type that represents an instance variable.
 #[repr(C)]