add python3-sphinx to dependencies

diff --git a/install-hdl-apt-reqs b/install-hdl-apt-reqs
index 52cad9234561d1c0fc50ffac7dd05fa1b0d021d9..2fca663b9945f2c34ae197d855c862cf36725c23 100755 (executable)
--- a/install-hdl-apt-reqs
+++ b/install-hdl-apt-reqs
@@ -39,6 +39,7 @@ apt-get install -y autoconf \
     python3-nose \
     python3-setuptools \
     python3-venv \
+    python3-sphinx \
     qemu-system-ppc \
     tcl \
     tcl-dev \