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+VERSION='13.0.0_r10'
+====================
+
+IMPORTANT
+---------
+The SDK 33 (android version 13), contrary to previous versions, does NOT include
+an system image anymore. 
+
+You will notice a significantly reduced source tree, a smaller output sdk-zip-file 
+and will experience a much shorter build time. This is, because the build receipe
+does not generate a system image.
+
+This is ok, because you do not really need it (unless you use a VM instead of a 
+real device) for development.
+
+But do not worry, you still can build it! But not from the sdk source tree!
+
+Simply follow the instructions here to create a system image:
+https://source.android.com/docs/setup/create/gsi#building-gsis
+
+You need to pull a different source tree.
+
+For the most up-to-date android 13, the branch to use is "android13-gsi".
+
+I have tested building it with the same build environent like for the sdk, and
+it works without any issues!
+
+
+Notes
+-----
+
+- simultaneous builds of win and linux sdk may fail. Default is linux only. If desired, edit build.sh and change the settings.
+- the build.sh differs significantly to previous versions, because building 
+conscrypt will run in multiple issues and result in (unrecoverable) errors unless 
+some additional modules are built from source.
+
+All commands need to be executed from the sdk folder!
+
+Build receipe
+-------------
+
+1) Install dependencies (you will be asked for root password to install packages):
+
+./dependencies.sh
+
+2) Download the source code:
+
+./download.sh
+
+3) Compile the sdk:
+
+./build.sh
+
+When the build finishes sucessfully, you get a list of the important generated sdk files.
+
+Have fun!