doc/Makefile: create and clean _static

diff --git a/doc/Makefile b/doc/Makefile
index 8b0b81d..b93571d 100644 (file)
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -39,9 +39,11 @@ help:
        @echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
 
 clean:
+       -rm -rf _static
        -rm -rf $(BUILDDIR)/*
 
 html:
+       mkdir -p _static
        $(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
        @echo
        @echo "Build finished. The HTML pages are in $(BUILDDIR)/html."