[commit: ghc] wip/fix-docs: circleci: Install sphinx on Darwin (c32b835)

[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/c32b8356704d8a714a5520826c26718fc6608d13/ghc

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

commit c32b8356704d8a714a5520826c26718fc6608d13
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Sat Aug 4 00:21:58 2018 -0400

    circleci: Install sphinx on Darwin


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c32b8356704d8a714a5520826c26718fc6608d13
 .circleci/prepare-system.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.circleci/prepare-system.sh b/.circleci/prepare-system.sh
index c9320ed..b09f4f8 100755
--- a/.circleci/prepare-system.sh
+++ b/.circleci/prepare-system.sh
@@ -55,6 +55,7 @@ case "$(uname)" in
     # does not work.
     brew upgrade python
     brew install ghc cabal-install ncurses gmp
+    pip install sphinx
     cabal update
     cabal install --reinstall alex happy haddock hscolour --index-state=$hackage_index_state
     # put them on the $PATH, don't fail if already installed