Android cross-compilation instructions.

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+Quick how-o cross compile tinc for android (done from $HOME/android/):
+
+- Download android NDK and setup local ARM toolchain:
+wget http://dl.google.com/android/ndk/android-ndk-r8b-linux-x86.tar.bz2
+tar xfj android-ndk-r8b-linux-x86.tar.bz2
+./android-ndk-r8b/build/tools/make-standalone-toolchain.sh --platform=android-5 --install-dir=/tmp/my-android-toolchain
+
+- Download and cross-compile openSSL for ARM:
+wget http://www.openssl.org/source/openssl-1.0.1c.tar.gz
+tar xfz openssl-1.0.1c.tar.gz
+cd openssl-1.0.1c
+./Configure dist
+make CC=/tmp/my-android-toolchain/bin/arm-linux-androideabi-gcc AR="/tmp/my-android-toolchain/bin/arm-linux-androideabi-ar r" RANLIB=/tmp/my-android-toolchain/bin/arm-linux-androideabi-ranlib
+
+- Clone and cross-compile tinc:
+git clone git://tinc-vpn.org/tinc
+cd tinc
+autoreconf -fsi
+CC=/tmp/my-android-toolchain/bin/arm-linux-androideabi-gcc ./configure --host=arm-linux --disable-lzo --with-openssl-lib=$HOME/android/openssl-1.0.1c --with-openssl-include=$HOME/android/openssl-1.0.1c/include/
+make -j5