我成功地修改了android源代码（android 5.0），然后我修改了aapt源代码，并且只想构建aapt。我cd到appt目录并使用mm命令，错误是：
ybwang@ybwang-VirtualBox:~/Documents/Android/android-5.0.0_r2/frameworks/base/tools/aapt$ mm
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=5.0
TARGET_PRODUCT=full
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a
TARGET_CPU_VARIANT=generic
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.13.0-32-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=LRX21M
OUT_DIR=out
============================================
make: Entering directory `/home/ybwang/Documents/Android/android-5.0.0_r2'
Export includes file: frameworks/base/tools/aapt/Android.mk -- out/host/linux-x86/obj32/STATIC_LIBRARIES/libaapt_intermediates/export_includes
Import includes file: out/host/linux-x86/obj32/EXECUTABLES/aapt_intermediates/import_includes
Export includes file: frameworks/base/tools/aapt/Android.mk -- out/host/linux-x86/obj32/EXECUTABLES/aapt_intermediates/export_includes
make: *** No rule to make target `out/target/product/generic/obj/STATIC_LIBRARIES/libexpat_static_intermediates/export_includes', needed by `out/target/product/generic/obj/EXECUTABLES/aapt_intermediates/import_includes'. Stop.
make: Leaving directory `/home/ybwang/Documents/Android/android-5.0.0_r2'
#### make failed to build some targets (2 seconds) ####
如何解决这个问题？有人能帮我吗？ 感谢