diff --git a/core/64_bit_blacklist.mk b/core/64_bit_blacklist.mk
index a237935..b7420cd 100644
--- a/core/64_bit_blacklist.mk
+++ b/core/64_bit_blacklist.mk
@@ -1,10 +1,5 @@
 ifneq ($(TARGET_2ND_ARCH),)
 
-# chromium-libpac needs porting to the chromium_org V8 instead of legacy V8.
-_64_bit_directory_blacklist += \
-	external/chromium-libpac \
-	external/v8 \
-
 # misc build errors
 _64_bit_directory_blacklist += \
 	device/generic/goldfish/opengl \
diff --git a/core/binary.mk b/core/binary.mk
index 4578261..9dab23f 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -9,7 +9,9 @@
 include $(BUILD_SYSTEM)/base_rules.mk
 #######################################
 
-my_ndk_version_root :=
+my_ndk_sysroot :=
+my_ndk_sysroot_include :=
+my_ndk_sysroot_lib :=
 ifdef LOCAL_SDK_VERSION
   ifdef LOCAL_NDK_VERSION
     $(error $(LOCAL_PATH): LOCAL_NDK_VERSION is now retired.)
@@ -18,7 +20,13 @@
     $(error $(LOCAL_PATH): LOCAL_SDK_VERSION cannot be used in host module)
   endif
   my_ndk_source_root := $(HISTORICAL_NDK_VERSIONS_ROOT)/current/sources
-  my_ndk_version_root := $(HISTORICAL_NDK_VERSIONS_ROOT)/current/platforms/android-$(LOCAL_SDK_VERSION)/arch-$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)
+  my_ndk_sysroot := $(HISTORICAL_NDK_VERSIONS_ROOT)/current/platforms/android-$(LOCAL_SDK_VERSION)/arch-$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)
+  my_ndk_sysroot_include := $(my_ndk_sysroot)/usr/include
+  ifeq (x86_64,$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
+    my_ndk_sysroot_lib := $(my_ndk_sysroot)/usr/lib64
+  else
+    my_ndk_sysroot_lib := $(my_ndk_sysroot)/usr/lib
+  endif
 
   # Set up the NDK stl variant. Starting from NDK-r5 the c++ stl resides in a separate location.
   # See ndk/docs/CPLUSPLUS-SUPPORT.html
@@ -198,7 +206,7 @@
 ifndef LOCAL_IS_HOST_MODULE
 ifdef LOCAL_SDK_VERSION
 my_target_project_includes :=
-my_target_c_includes := $(my_ndk_stl_include_path) $(my_ndk_version_root)/usr/include
+my_target_c_includes := $(my_ndk_stl_include_path) $(my_ndk_sysroot_include)
 my_target_global_cppflags := $(my_ndk_stl_cppflags)
 else
 my_target_project_includes := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_PROJECT_INCLUDES)
@@ -817,7 +825,7 @@
 # Add the NDK libraries to the built module dependency
 my_system_shared_libraries_fullpath := \
     $(my_ndk_stl_shared_lib_fullpath) \
-    $(addprefix $(my_ndk_version_root)/usr/lib/, \
+    $(addprefix $(my_ndk_sysroot_lib)/, \
         $(addsuffix $(so_suffix), $(my_system_shared_libraries)))
 
 built_shared_libraries += $(my_system_shared_libraries_fullpath)
diff --git a/core/clang/config.mk b/core/clang/config.mk
index a79a558..b8f76f2 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -11,10 +11,11 @@
 
 CLANG := $(LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)
 CLANG_CXX := $(LLVM_PREBUILTS_PATH)/clang++$(BUILD_EXECUTABLE_SUFFIX)
-CLANG_TBLGEN := $(LLVM_PREBUILTS_PATH)/clang-tblgen$(BUILD_EXECUTABLE_SUFFIX)
 LLVM_AS := $(LLVM_PREBUILTS_PATH)/llvm-as$(BUILD_EXECUTABLE_SUFFIX)
 LLVM_LINK := $(LLVM_PREBUILTS_PATH)/llvm-link$(BUILD_EXECUTABLE_SUFFIX)
-TBLGEN := $(LLVM_PREBUILTS_PATH)/tblgen$(BUILD_EXECUTABLE_SUFFIX)
+
+CLANG_TBLGEN := $(HOST_OUT_EXECUTABLES)/clang-tblgen$(BUILD_EXECUTABLE_SUFFIX)
+TBLGEN := $(HOST_OUT_EXECUTABLES)/tblgen$(BUILD_EXECUTABLE_SUFFIX)
 
 
 # Clang flags for all host or target rules
diff --git a/core/executable_internal.mk b/core/executable_internal.mk
index a7c3e86..c235a72 100644
--- a/core/executable_internal.mk
+++ b/core/executable_internal.mk
@@ -38,12 +38,12 @@
 # so we don't have race condition when the system libraries (such as libc, libstdc++) are also built in the tree.
 my_target_global_ld_dirs := \
     $(addprefix -L, $(patsubst %/,%,$(dir $(my_ndk_stl_shared_lib_fullpath))) \
-    $(my_ndk_version_root)/usr/lib) \
+    $(my_ndk_sysroot_lib)) \
     $(my_target_global_ld_dirs)
 my_target_global_ldflags := $(my_ndk_stl_shared_lib) $(my_target_global_ldflags)
-my_target_crtbegin_dynamic_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtbegin_dynamic.o)
-my_target_crtbegin_static_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtbegin_static.o)
-my_target_crtend_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtend_android.o)
+my_target_crtbegin_dynamic_o := $(wildcard $(my_ndk_sysroot_lib)/crtbegin_dynamic.o)
+my_target_crtbegin_static_o := $(wildcard $(my_ndk_sysroot_lib)/crtbegin_static.o)
+my_target_crtend_o := $(wildcard $(my_ndk_sysroot_lib)/crtend_android.o)
 endif
 $(linked_module): PRIVATE_TARGET_GLOBAL_LD_DIRS := $(my_target_global_ld_dirs)
 $(linked_module): PRIVATE_TARGET_GLOBAL_LDFLAGS := $(my_target_global_ldflags)
diff --git a/core/product.mk b/core/product.mk
index cf6fb9a..fd405ad 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -252,7 +252,8 @@
 
 
 _product_stash_var_list += \
-	DEFAULT_SYSTEM_DEV_CERTIFICATE
+	DEFAULT_SYSTEM_DEV_CERTIFICATE \
+	WITH_DEXPREOPT
 
 #
 # Stash values of the variables in _product_stash_var_list.
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index 7f8a483..bda44f4 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -49,11 +49,11 @@
 # so we don't have race condition when the system libraries (such as libc, libstdc++) are also built in the tree.
 my_target_global_ld_dirs := \
     $(addprefix -L, $(patsubst %/,%,$(dir $(my_ndk_stl_shared_lib_fullpath))) \
-    $(my_ndk_version_root)/usr/lib) \
+    $(my_ndk_sysroot_lib)) \
     $(my_target_global_ld_dirs)
 my_target_global_ldflags := $(my_ndk_stl_shared_lib) $(my_target_global_ldflags)
-my_target_crtbegin_so_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtbegin_so.o)
-my_target_crtend_so_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtend_so.o)
+my_target_crtbegin_so_o := $(wildcard $(my_ndk_sysroot_lib)/crtbegin_so.o)
+my_target_crtend_so_o := $(wildcard $(my_ndk_sysroot_lib)/crtend_so.o)
 endif
 $(linked_module): PRIVATE_TARGET_GLOBAL_LD_DIRS := $(my_target_global_ld_dirs)
 $(linked_module): PRIVATE_TARGET_GLOBAL_LDFLAGS := $(my_target_global_ldflags)
diff --git a/envsetup.sh b/envsetup.sh
index f75bf88..60726d3 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -1401,7 +1401,7 @@
       else
         case `uname -s` in
             Darwin)
-                export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home
+                export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)
                 ;;
             *)
                 export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64