--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -14,7 +14,7 @@ PAPER        =
 SOURCES      =
 DISTVERSION  = $(shell $(PYTHON) tools/extensions/patchlevel.py)
 REQUIREMENTS = requirements.txt
-SPHINXERRORHANDLING = --fail-on-warning
+#SPHINXERRORHANDLING = --fail-on-warning
 
 # Internal variables.
 PAPEROPT_a4     = --define latex_elements.papersize=a4paper