centos7 build fails due to missing sphinx
Error when running Shake build system: at want, called at src/Main.hs:119:44 in main:Main * Depends on: binary-dist at apply1, called at src/Development/Shake/Internal/Rules/Rerun.hs:41:5 in shake-0.19.6-8286668a44703a51ff535fdb488bbcfda41ff46d5b093c47fded2bc0122481dd:Development.Shake.Internal.Rules.Rerun * Depends on: binary-dist-dir at need, called at src/Rules/BinaryDist.hs:228:24 in main:Rules.BinaryDist * Depends on: docs at need, called at src/Rules/Documentation.hs:115:9 in main:Rules.Documentation * Depends on: _build/docs/users_guide/build-man/ghc.1 at error, called at src/Builder.hs:445:43 in main:Builder * Raised the exception: Non optional builder 'sphinx-build' is not specified in 'hadrian/cfg/system.config' file. Build failed.
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