knoll 0.4.0

A command-line tool for configuring macOS displays
Documentation 
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diff --git i/src/core_graphics.rs w/src/core_graphics.rs
index 5564fd2..037612f 100644
--- i/src/core_graphics.rs
+++ w/src/core_graphics.rs
@@ -347,6 +347,8 @@ extern "C" {
         enabled: bool,
     ) -> CGError;
 
+    fn SLSSetDisplayRotation(display_id: CGDirectDisplayID, rotation: i32) -> CGError;
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -617,6 +619,14 @@ pub fn cg_display_mirrors_display(display_id: DisplayID) -> Option<DisplayID> {
     }
 }
 
+pub fn cgx_set_display_rotation(display_id: DisplayID, rotation: i32) -> CGError {
+    println!(
+        "Setting rotation of display {} to {} degrees",
+        display_id.id, rotation
+    );
+    unsafe { SLSSetDisplayRotation(display_id.id, rotation) }
+}
+
 /// Helper to set the rotation of a display via the MPDisplay Objective-C class.
 // TODO As this is the only use of Objective-C in this code-base,
 //   in the future it may be worth investigate the private
diff --git i/src/real_displays.rs w/src/real_displays.rs
index bf30f9b..2fad91f 100644
--- i/src/real_displays.rs
+++ w/src/real_displays.rs
@@ -295,7 +295,11 @@ impl DisplayConfigTransaction for RealDisplayConfigTransaction {
         )?;
 
         for (&display_id, &rotation) in &self.rotations {
-            mpd_set_rotation(display_id, rotation.into())
+            cg_error_to_result(
+                cgx_set_display_rotation(display_id, rotation.into()),
+                // TODO FIX!!!
+                format!("While attempting to rotate display {}", "").as_str(),
+            )?
         }
 
         self.dropped = true;