diff --git a/.travis.yml b/.travis.yml
index a915f7a46ec3d50..ab85febb9986400 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -56,7 +56,12 @@ matrix:
         # The theme used by the docs is stored separately, so we need to install that as well.
         - python -m pip install sphinx==2.2.0 blurb python-docs-theme
       script:
-        - make check suspicious html SPHINXOPTS="-q -W -j4"
+        - python -m pip freeze
+        - blurb help
+        - sphinx-build --version
+        - make check SPHINXOPTS="-q -W -j4"
+        - make suspicious SPHINXOPTS="-q -W -j4"
+        - make html SPHINXOPTS="-q -W -j4"
     - name: "Documentation tests"
       os: linux
       language: c
@@ -71,7 +76,11 @@ matrix:
         - make -j4
         - make -C Doc/ PYTHON=../python venv
       script:
-        xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W -j4" doctest
+        - ./python --version
+        - echo "SPHINX"
+        - sphinx-build --version || true
+        - echo "SPHINX--"
+        - xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W -j4" doctest
     - name: "Test code coverage (Python)"
       os: linux
       language: c
diff --git a/Doc/Makefile b/Doc/Makefile
index c11a7ca5c1bcb70..f6d514118f93b2c 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -68,6 +68,21 @@ build:
 		echo ""; \
 		exit 1; \
 	fi
+
+	echo "PYTHON=$(PYTHON)"
+	$(PYTHON) --version
+	echo
+
+	echo "SPHINXBUILD=$(SPHINXBUILD)"
+	$(SPHINXBUILD) --version
+	echo
+
+	echo "VENVDIR=$(VENVDIR)"
+	$(VENVDIR)/bin/python --version
+	head -n1 $(VENVDIR)/bin/sphinx-build
+	$(VENVDIR)/bin/sphinx-build --version
+	echo
+
 	$(SPHINXBUILD) $(ALLSPHINXOPTS)
 	@echo