diff --git a/mk/rustpkg.mk b/mk/rustpkg.mk
index 2088f03ac7e..e2b5eaafe30 100644
--- a/mk/rustpkg.mk
+++ b/mk/rustpkg.mk
@@ -12,11 +12,11 @@ DO_CLEAN_$(1) = rm -rf $$(DONE_$(1)) $(CFG_BUILD_HOME)/workspace/build/$(CFG_TAR
 
 EXTRA_RFLAGS_$(1) =
 
-ifeq ($(shell uname -s),Darwin)
-ifeq ($(shell sw_vers | grep -c 10.6),1)
+ifeq ($$(shell uname -s),Darwin)
+ifeq ($$(shell sw_vers | grep -c 10.6),1)
 EXTRA_RFLAGS_$(1) += --cfg mac_10_6
 endif
-ifeq ($(shell sw_vers | grep -c 10.7),1)
+ifeq ($$(shell sw_vers | grep -c 10.7),1)
 EXTRA_RFLAGS_$(1) += --cfg mac_10_7
 endif
 else
diff --git a/src/components/main/compositing/run.rs b/src/components/main/compositing/run.rs
index 6f091c51b64..f833aa5d4ff 100644
--- a/src/components/main/compositing/run.rs
+++ b/src/components/main/compositing/run.rs
@@ -89,13 +89,13 @@ pub fn run_compositor(compositor: &CompositorTask) {
                 ChangeReadyState(ready_state) => window.set_ready_state(ready_state),
                 ChangeRenderState(render_state) => window.set_render_state(render_state),
 
-                SetUnRenderedColor(id, color) => {
-                  match compositor_layer {
-                      Some(ref mut layer) => {
-                          layer.unrendered_color = color;
-                      }
-                      None => {}
-                  }
+                SetUnRenderedColor(_id, color) => {
+                    match compositor_layer {
+                        Some(ref mut layer) => {
+                            layer.unrendered_color = color;
+                        }
+                        None => {}
+                    }
                 }
 
 
diff --git a/src/components/script/dom/bindings/codegen/CodegenRust.py b/src/components/script/dom/bindings/codegen/CodegenRust.py
index a20dc523357..46979ca7ce6 100644
--- a/src/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/src/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2170,7 +2170,12 @@ class CGImports(CGWrapper):
         # TODO imports to cover descriptors, etc.
 
         def _useString(imports):
-            return '#[allow(non_uppercase_statics,unused_imports,unused_variable,unused_unsafe,unused_mut,dead_assignment)];\n' + ''.join(['use %s;\n' % i for i in imports]) + '\n'
+            # Allow unreachable_code because we use 'break' in a way that sometimes produces
+            # two 'break's in a row. See for example CallbackMember.getArgConversions.
+            return '\n'.join([
+                '#[allow(unreachable_code,non_uppercase_statics,unused_imports,unused_variable,unused_unsafe,unused_mut,dead_assignment)];',
+                ''.join('use %s;\n' % i for i in imports),
+                ''])
         CGWrapper.__init__(self, child,
                            declarePre=_useString(sorted(declareImports)))
 
diff --git a/src/components/script/dom/window.rs b/src/components/script/dom/window.rs
index 4814550e42f..aeb6b317a07 100644
--- a/src/components/script/dom/window.rs
+++ b/src/components/script/dom/window.rs
@@ -28,7 +28,6 @@ use std::comm::SharedChan;
 use std::hashmap::HashSet;
 use std::ptr;
 use std::int;
-use std::libc;
 use std::rt::io::timer::Timer;
 use std::task::spawn_with;
 use js::jsapi::JSVal;