Update with the Android OS SDK install instructions.

svn:r20822

BUILD

@@ -2,10 +2,33 @@ This document explains how to properly build an Android package of Orbot from
 source.
 
 Please install the following prerequisites:
-	Android SDK
+	Android OS SDK
 	droid-wrapper: http://github.com/tmurakam/droid-wrapper
 	libevent source
 	Tor source (most recent git master branch)
 
+Install and prepare the Android OS SDK ( http://source.android.com/download )
+on Debian Lenny:
+
+	sudo apt-get install git-core gnupg sun-java5-jdk flex bison gperf \
+		libsdl-dev libesd0-dev libwxgtk2.6-dev build-essential zip \
+		curl libncurses5-dev zlib1g-dev
+
+	curl http://android.git.kernel.org/repo >~/bin/repo
+	chmod a+x ~/bin/repo
+
+	mkdir ~/mydroid
+	cd ~/mydroid
+
+	repo init -u git://android.git.kernel.org/platform/manifest.git
+	repo sync
+
+	# Paste in key from http://source.android.com/download next...
+	gpg --import
+
+	export ANDROID_JAVA_HOME=$JAVA_HOME
+	cd ~/mydroid
+	make
+
 XXX TODO: Explain build process for making a static Tor with our libevent, etc.
 XXX TODO: Explain build process for making a .apk file for install.