Build from android source failed

[qdk0901]

android source version: 4.1
throw many of errors: fatal error: cstddef: No such file or directory

[PabloGN]

I had the same error.
I changed 4.6 to 4.9 at build-android.sh and linked (ln -s) to allow accesses to 4.6 named directories at android ndk subdirs.
Also I linked platforms/Android-L to android-9
But I get:
/home/pablo/android-ndk-r10/sources/cxx-stl/gnu-libstdc++/4.6/include/cctype:64:11: error: '::isalnum' has not been declared
using ::isalnum;
Ubuntu Trusty 64b NDKr10

[PabloGN]

Hehe, I found the issue. I did a mistake, I chose the 64b version of the NDK, I mean, the NDK whose purpose is to generate binaries for 64bit machines. Besides of the host machine, whether it is 32 or 64b, but the target machine.