Conditionally link through ColorSync only if WINIT_LINK_COLORSYNC is set

to true

build.rs

@@ -0,0 +1,10 @@
+fn main() {
+    // If building for macos and WINIT_LINK_COLORSYNC is set to true
+    // use CGDisplayCreateUUIDFromDisplayID from ColorSync instead of CoreGraphics
+    if std::env::var("CARGO_CFG_TARGET_OS").map_or(false, |os| os == "macos")
+        && std::env::var("WINIT_LINK_COLORSYNC")
+            .map_or(false, |v| v == "1" || v.eq_ignore_ascii_case("true"))
+    {
+        println!("cargo:rustc-cfg=use_colorsync_cgdisplaycreateuuidfromdisplayid");
+    }
+}

src/platform_impl/macos/ffi.rs

@@ -161,7 +161,14 @@ pub const IO8BitOverlayPixels: &str = "O8";
 pub type CGWindowLevel = i32;
 pub type CGDisplayModeRef = *mut libc::c_void;
 
-#[link(name = "ColorSync", kind = "framework")]
+#[cfg_attr(
+    not(use_colorsync_cgdisplaycreateuuidfromdisplayid),
+    link(name = "CoreGraphics", kind = "framework")
+)]
+#[cfg_attr(
+    use_colorsync_cgdisplaycreateuuidfromdisplayid,
+    link(name = "ColorSync", kind = "framework")
+)]
 extern "C" {
     pub fn CGDisplayCreateUUIDFromDisplayID(display: CGDirectDisplayID) -> CFUUIDRef;
 }