[readme] Add "Building stand-alone" section from game.libretro readme

Readme.md

@@ -35,6 +35,44 @@ cmake -G"Eclipse CDT4 - Unix Makefiles" \
       $HOME/workspace/xbmc/project/cmake/addons
 ```
 
+# Building stand-alone
+
+Stand-alone builds are closer to "normal" software builds. The build system looks for its dependencies, by default with `/usr` and `/usr/local` prefixes.
+
+To provide these dependencies yourself in a local working directory, build Kodi with an installation prefix
+
+```shell
+./configure --prefix=$HOME/kodi
+make
+make install
+```
+
+Alternatively, configure Kodi per usual and install using `make install DESTDIR=$HOME/kodi`.
+
+Clone kodi-platform and create a CMake build directory
+
+```shell
+git clone https://github.com/xbmc/kodi-platform.git
+cd kodi-platform
+mkdir build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Debug \
+      -DCMAKE_INSTALL_PREFIX=$HOME/kodi \
+      ..
+make
+make install
+```
+
+With these dependencies in place, the add-on can be built. Point CMake to the add-on's build system instead of `$HOME/workspace/xbmc/project/cmake/addons`
+
+```shell
+cmake -DCMAKE_BUILD_TYPE=Debug \
+      -DCMAKE_INSTALL_PREFIX=$HOME/workspace/xbmc/addons \
+      -DCMAKE_PREFIX_PATH=$HOME/kodi \
+      -DPACKAGE_ZIP=1 \
+      ..
+```
+
 # Building in-tree (cross-compiling)
 
 Kodi's build system will fetch the add-on from the GitHub URL and git hash specified in [peripheral.joystick.txt](https://github.com/garbear/xbmc/blob/retroplayer-15alpha2/project/cmake/addons/addons/peripheral.joystick/peripheral.joystick.txt).