$ANDROID_NDK/build/tools/make_standalone_toolchain.py --arch=$ANDROID_ARCH --api=$ANDROID_API_LEVEL --install-dir /tmp/my-android-toolchain
PATH="/tmp/my-android-toolchain/bin:${PATH}" ./configure --arch=armv7 --cpu=armv7-a --enable-cross-compile --target-os=android --cross-prefix=arm-linux-androideabi- --cc=arm-linux-androideabi-clang
PATH="/tmp/my-android-toolchain/bin:${PATH}" make -j4