docker/build-deps: install sphinx elements from the packages, not with pip3

diff --git a/tools/docker/Dockerfile.build-deps b/tools/docker/Dockerfile.build-deps
index f4dfef2..8bade76 100644 (file)
--- a/tools/docker/Dockerfile.build-deps
+++ b/tools/docker/Dockerfile.build-deps
@@ -18,6 +18,5 @@ RUN apt-get --allow-releaseinfo-change update && \
        chrpath \
        libdw-dev libevent-dev libunwind8-dev \
        linkchecker \
-       && \
-    pip3 install breathe 'sphinx>=1.8.0b1' sphinx_rtd_theme
+       python3-sphinx python3-breathe python3-sphinx-rtd-theme
                   
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