最近想学习学习Android，就在自己到pc上装了Ubuntu 11.04，然后按照www.android.com上的说明，进行操作。
不过，过程中也遇到了不少问题，在此做个总结。
第一次，是在进行到repo sync一步的时候，本来想避开网络高负载时段，早上就开始下载代码，谁知还是没有整完，到了晚上，也就下了40%多，然后像死了一样不动。不忍心电脑累了一天，晚上也不能休息，就把终端强制关了。第二天，由于要上班，也只能晚上来搞代码，谁知也是搞了一会就搞不动了，也只能强制关掉。之后再repo sync，总是在10%左右的时候，就提示fetch error，然后只能强制关掉。如此反复几次，搞的更严重了，网都连不上了。后来在网上搜了好多解决方案，也尝试重新安装网卡驱动，不过还是没有化险为夷。没办法，只能重新安装ubuntu。
这次不敢怠慢了。刚好有天夜里两点多醒来了，就起来，开始取android代码，早上8点多醒来，总算取完了，之后开始编译，不过也不是一帆风顺。
开始，是编译的时候出现以下错误：
/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: 没有该文件或目录
解决方法：
安装libc6-dev-i386。命令：sudo apt-get install libc6-dev-i386
当然，首先要确定系统是x86_64 GNU/Linux
使用命令：uname -a
如果得到如下的结果，说明是OK的了。
Linux mm-desktop 2.6.27-9-generic #1 SMP Thu Nov 20 22:15:32 UTC 2008 x86_64 GNU/Linux
出现如下错误：
cannot find -lstdc++
解决方法：
apt-get install g++-multilib
apt-get install lib32z1-dev
apt-get install lib32ncurses5-dev
接下来出现的错误，着实让我费了不少劲。
错误内容如下：
host C++: aidl <= out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp
frameworks/base/tools/aidl/aidl_language_l.l: In function ‘int yylex()’:
frameworks/base/tools/aidl/aidl_language_l.l:58: error: ‘IMPORT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:59: error: ‘IMPORT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:63: error: ‘PACKAGE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:64: error: ‘PACKAGE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:82: error: ‘PARCELABLE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:82: error: ‘PARCELABLE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:83: error: ‘INTERFACE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:83: error: ‘INTERFACE’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:84: error: ‘IN’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:84: error: ‘IN’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:85: error: ‘OUT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:85: error: ‘OUT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:86: error: ‘INOUT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:86: error: ‘INOUT’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:87: error: ‘ONEWAY’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:87: error: ‘ONEWAY’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:89: error: ‘ARRAY’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:89: error: ‘ARRAY’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:91: error: ‘IDENTIFIER’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:91: error: ‘IDENTIFIER’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:93: error: ‘GENERIC’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:93: error: ‘GENERIC’ was not declared in this scope
frameworks/base/tools/aidl/aidl_language_l.l:98: error: ‘IDENTIFIER’ was not declared in this scope
make: *** [out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_l.o] 错误 1
网上搜寻解决方案，有位老兄说，改下文件build/core/definitions.mk，可以解决。
方案：
The solution - at least for me - is simply to remove the offending lines *
716:721* in *build/core/definitions.mk* (I am speaking about the version
committed on Sun, 16 Jan 2011 18:14:04 UTC<http://android.git.kernel.org/?p=platform/build.git;a=blob;f=core/def...>
)
我的代码比较新，然后就找到了该文件 Sun, 16 Jan 2011 18:14:04 UTC时的提交，找到了对应的语句，修改之后，make，error依旧。该药方对我无效。
继续搜寻，有位老兄说，在apt-get instal flex之前，rm -rf out/就OK了。
方案：
user should rm -rf out/ when apt-get instal flex and software
requirements compile needed by android
按照该方案，执行了下rm -rf out/，然后再apt-get instal flex，果然药到病除。
先总结以上。
有教训了再继续追加。