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It's silly to require all the time-consuming cmake configuration for the source code, if all you want to do is to build the documentation. My own website update script will like this optimisation, and so will Buildscr. In order to make doc/CMakeLists.txt work standalone, I had to add a 'project' header (citing no languages, so that cmake won't even bother looking for a C compiler); include FindGit, which cmake/setup.cmake now won't be doing for it; change all references to CMAKE_SOURCE_DIR to CMAKE_CURRENT_SOURCE_DIR/.. (since now the former will be defined differently in a nested or standalone doc build); and spot whether we're nested or not in order to conditionalise things designed to interoperate with the parent CMakeLists.