diff -rupN --no-dereference gdal-3.1.0-fedora/doc/Makefile gdal-3.1.0-fedora-new/doc/Makefile
--- gdal-3.1.0-fedora/doc/Makefile	2020-05-04 11:18:27.000000000 +0200
+++ gdal-3.1.0-fedora-new/doc/Makefile	2020-05-18 11:28:49.090890982 +0200
@@ -2,7 +2,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    = --keep-going -j auto -W
+SPHINXOPTS    = --keep-going -j auto
 SPHINXBUILD   = sphinx-build
 SOURCEDIR     = source
 BUILDDIR      = build