how to build sphinx doc when there is extension

[PICCA Frederic-Emmanuel]

Hello

I am using this snipset when I want to build the sphinx documentation for all 
python available. (this is a sort of unit test).
Usually the sphinx doc use auto-doc and then it allows to check that all 
modules can be imported. 

override_dh_sphinxdoc:
ifeq (,$(findstring nodocs, $(DEB_BUILD_OPTIONS)))
        PYBUILD_SYSTEM=custom \
        PYBUILD_BUILD_ARGS="cd doc && PYTHONPATH={build_dir} 
http_proxy='127.0.0.1:9' {interpreter} -c \"import sys;from sphinx import 
main;sys.exit(main(sys.argv))\" -N -bhtml source build/html" dh_auto_build  # 
HTML generator
        dh_installdocs "doc/build/html" -p python-pyfai-doc
        dh_sphinxdoc -O--buildsystem=pybuild
endif


I would like your opinion about this and if there is better way to do this ?

thanks

Frederic