diff --git a/libs/gui/Android.mk b/libs/gui/Android.mk
index ca94aa3..fffe28a 100644
--- a/libs/gui/Android.mk
+++ b/libs/gui/Android.mk
@@ -1,7 +1,10 @@
-LOCAL_PATH:= $(call my-dir)
+LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES:= \
+LOCAL_CLANG := true
+LOCAL_CPPFLAGS := -std=c++11
+
+LOCAL_SRC_FILES := \
 	IGraphicBufferConsumer.cpp \
 	IConsumerListener.cpp \
 	BitTube.cpp \
@@ -47,7 +50,7 @@
 	liblog
 
 
-LOCAL_MODULE:= libgui
+LOCAL_MODULE := libgui
 
 ifeq ($(TARGET_BOARD_PLATFORM), tegra)
 	LOCAL_CFLAGS += -DDONT_USE_FENCE_SYNC
diff --git a/libs/gui/SensorEventQueue.cpp b/libs/gui/SensorEventQueue.cpp
index 1305e9f..6f5f204 100644
--- a/libs/gui/SensorEventQueue.cpp
+++ b/libs/gui/SensorEventQueue.cpp
@@ -157,7 +157,7 @@
         ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend),
                 MSG_DONTWAIT | MSG_NOSIGNAL);
         if (size < 0) {
-            ALOGE("sendAck failure %d %d", size, mNumAcksToSend);
+            ALOGE("sendAck failure %zd %d", size, mNumAcksToSend);
         } else {
             mNumAcksToSend = 0;
         }
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 6446926..547dc7d 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -752,14 +752,14 @@
 
 status_t ScreenshotClient::update(const sp<IBinder>& display, Rect sourceCrop,
         bool useIdentityTransform) {
-    return ScreenshotClient::update(display, sourceCrop, 0, 0, 0, -1UL,
+    return ScreenshotClient::update(display, sourceCrop, 0, 0, 0, -1U,
             useIdentityTransform, ISurfaceComposer::eRotateNone);
 }
 
 status_t ScreenshotClient::update(const sp<IBinder>& display, Rect sourceCrop,
         uint32_t reqWidth, uint32_t reqHeight, bool useIdentityTransform) {
     return ScreenshotClient::update(display, sourceCrop, reqWidth, reqHeight,
-            0, -1UL, useIdentityTransform, ISurfaceComposer::eRotateNone);
+            0, -1U, useIdentityTransform, ISurfaceComposer::eRotateNone);
 }
 
 void ScreenshotClient::release() {