Include source path from another doxyfile

Hi,

I'm often using git submodules in my projects. Each submodule has it's
own doxyfile. If i include the submodule in my parent project, there's
a seperate doxyfile, but i don't want to specify the sources again for
each submodule. Is there a way, to include the sources of a doxyfile
into another doxyfile?

Yours
Franz

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