diff -up waf-2.0.18/docs/sphinx/wscript.orig waf-2.0.18/docs/sphinx/wscript
--- waf-2.0.18/docs/sphinx/wscript.orig	2019-04-20 19:06:49.000000000 +0200
+++ waf-2.0.18/docs/sphinx/wscript	2019-10-05 18:00:54.822911036 +0200
@@ -19,7 +19,6 @@ def configure(cfg):
 	cfg.find_program('convert', var='CONVERT')
 	cfg.load('daemon', tooldir=['../../playground/daemon/'])
 	cfg.find_program("sphinx-build", var="SPHINX_BUILD")
-	cfg.env.SPHINX_ARGS = ['-W']
 
 def build(bld):
 	bld.path.make_node('_static').mkdir()