diff --git a/winit-core/build.rs b/winit-core/build.rs
index 1105d584..915ec231 100644
--- a/winit-core/build.rs
+++ b/winit-core/build.rs
@@ -6,21 +6,6 @@ fn main() {
 
     // Setup cfg aliases.
     cfg_aliases! {
-        // Systems.
-        android_platform: { target_os = "android" },
         web_platform: { all(target_family = "wasm", target_os = "unknown") },
-        macos_platform: { target_os = "macos" },
-        ios_platform: { all(target_vendor = "apple", not(target_os = "macos")) },
-        windows_platform: { target_os = "windows" },
-        free_unix: { all(unix, not(target_vendor = "apple"), not(android_platform), not(target_os = "emscripten")) },
-        redox: { target_os = "redox" },
-
-        // Native displays.
-        x11_platform: { all(feature = "x11", free_unix, not(redox)) },
-        wayland_platform: { all(feature = "wayland", free_unix, not(redox)) },
-        orbital_platform: { redox },
     }
-
-    // Winit defined cfgs.
-    println!("cargo:rustc-check-cfg=cfg(unreleased_changelogs)");
 }
diff --git a/winit-core/src/event.rs b/winit-core/src/event.rs
index 6f83fca9..29a5a947 100644
--- a/winit-core/src/event.rs
+++ b/winit-core/src/event.rs
@@ -46,10 +46,6 @@ pub enum StartCause {
 #[derive(Debug, Clone, PartialEq)]
 pub enum WindowEvent {
     /// The activation token was delivered back and now could be used.
-    #[cfg_attr(not(any(x11_platform, wayland_platform)), allow(rustdoc::broken_intra_doc_links))]
-    /// Delivered in response to [`request_activation_token`].
-    ///
-    /// [`request_activation_token`]: crate::platform::startup_notify::WindowExtStartupNotify::request_activation_token
     ActivationTokenDone { serial: AsyncRequestSerial, token: ActivationToken },
 
     /// The size of the window's surface has changed.
@@ -1083,7 +1079,6 @@ pub struct SurfaceSizeWriter {
 }
 
 impl SurfaceSizeWriter {
-    #[cfg(not(orbital_platform))]
     pub fn new(new_surface_size: Weak<Mutex<PhysicalSize<u32>>>) -> Self {
         Self { new_surface_size }
     }
diff --git a/winit-core/src/window.rs b/winit-core/src/window.rs
index 3a99f33a..e00e9dd2 100644
--- a/winit-core/src/window.rs
+++ b/winit-core/src/window.rs
@@ -1546,12 +1546,7 @@ impl ActivationToken {
     /// only result in the side effect of the operation involving it being ignored (e.g. window
     /// won't get focused automatically), but won't yield any errors.
     ///
-    /// To obtain a valid token, use
-    #[cfg_attr(
-        any(x11_platform, wayland_platform),
-        doc = " [`request_activation_token`](crate::platform::startup_notify::WindowExtStartupNotify::request_activation_token)."
-    )]
-    #[cfg_attr(not(any(x11_platform, wayland_platform)), doc = " `request_activation_token`.")]
+    /// To obtain a valid token consult the backend implementation.
     pub fn from_raw(token: String) -> Self {
         Self { token }
     }