编译的Android 2.3系统时，找不到路径\资料夹

在编译Android 2.3系统时，出现以下提示文字，请问这是正常的吗？谢谢回覆
root@bella-VirtualBox:/opt/EmbedSky/TQ210/TQ210_Android_2.3_v1.1# ls
api       build            dalvik       external    libcore   packages  system
bionic    build_system.sh  development  frameworks  Makefile  prebuilt  vendor
bootable  cts              device       hardware    ndk       sdk
root@bella-VirtualBox:/opt/EmbedSky/TQ210/TQ210_Android_2.3_v1.1# ./build_system.sh


Build android for tq210


[[[[[[[ Build android platform ]]]]]]]

make -j1 PRODUCT-full_tq210-eng

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.3.1
TARGET_PRODUCT=full_tq210
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=GINGERBREAD
============================================
Checking build tools versions...
find: `frameworks/base/frameworks/base/docs/html': No such file or directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or directory
find: `out/target/common/docs/gen': No such file or directory

正常的，编译结束后会有提示的。