[commit: ghc] wip/fix-docs: circleci: Install sphinx on Darwin (25e7ffc)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/fix-docs
Link       : http://ghc.haskell.org/trac/ghc/changeset/25e7ffcdde86e348b3fcca4777377e8977598217/ghc

>---------------------------------------------------------------

commit 25e7ffcdde86e348b3fcca4777377e8977598217
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Sat Aug 4 00:21:58 2018 -0400

    circleci: Install sphinx on Darwin


>---------------------------------------------------------------

25e7ffcdde86e348b3fcca4777377e8977598217
 .circleci/prepare-system.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.circleci/prepare-system.sh b/.circleci/prepare-system.sh
index c9320ed..044e2d7 100755
--- a/.circleci/prepare-system.sh
+++ b/.circleci/prepare-system.sh
@@ -42,6 +42,7 @@ case "$(uname)" in
         fail "TARGET=$target not supported"
       fi
     else
+      apt-get install -qy sphinx-build
       cabal update
       cabal install --reinstall hscolour
       sudo ln -s /home/ghc/.cabal/bin/HsColour /usr/local/bin/HsColour || true
@@ -55,6 +56,7 @@ case "$(uname)" in
     # does not work.
     brew upgrade python
     brew install ghc cabal-install ncurses gmp
+    pip3 install sphinx
     cabal update
     cabal install --reinstall alex happy haddock hscolour --index-state=$hackage_index_state
     # put them on the $PATH, don't fail if already installed