Autotools and other build systems allow out VPATH (out of source) builds. During such a build some .rst files are generated in the builddir, others are in the sourcedir. The compiled documentation must include both files.
How to achieve this with sphinx-build?
M3W6+V4 Fieldale, Virginia
Sphinx only supports files on source directory. So I propose you to move them to source directory before running sphinx-build.