sphinx-build -b latex -c etc -d $(BUILDDIR)/doctrees \
requirements $(BUILDDIR)/requirements/latex
$(MAKE) -C $(BUILDDIR)/requirements/latex \
LATEXOPTS='--interaction=nonstopmode' all-pdf
sphinx-build -b latex -c etc -d $(BUILDDIR)/doctrees \
requirements $(BUILDDIR)/requirements/latex
$(MAKE) -C $(BUILDDIR)/requirements/latex \
LATEXOPTS='--interaction=nonstopmode' all-pdf