[commit: ghc] wip/fix-docs: circleci: Install sphinx on Darwin (aba2a32)

[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/aba2a323d5974c26c4a01da5040325fe58ec1dba/ghc

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

commit aba2a323d5974c26c4a01da5040325fe58ec1dba
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Sat Aug 4 00:21:58 2018 -0400

    circleci: Install sphinx on Darwin


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

aba2a323d5974c26c4a01da5040325fe58ec1dba
 .circleci/prepare-system.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.circleci/prepare-system.sh b/.circleci/prepare-system.sh
index c9320ed..df3af88 100755
--- a/.circleci/prepare-system.sh
+++ b/.circleci/prepare-system.sh
@@ -54,7 +54,8 @@ case "$(uname)" in
     # It looks like we already have python2 here and just installing python3
     # does not work.
     brew upgrade python
-    brew install ghc cabal-install ncurses gmp
+    brew install ghc cabal-install ncurses gmp pip
+    pip install sphinx
     cabal update
     cabal install --reinstall alex happy haddock hscolour --index-state=$hackage_index_state
     # put them on the $PATH, don't fail if already installed