[GHC] #11604: Build system fails after submodule update

[GHC]

#11604: Build system fails after submodule update
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           Reporter:  niteria        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I got [https://phabricator.haskell.org/P100 this] error after updating the
 transformers submodule with `git submodule update --remote
 libraries/transformers`.

 Steps to repro:
 {{{
 git checkout 426a25c719f74054758eaaf15daf5760f8d068fb
 make clean && make distclean && ./boot && ./configure && make
 git submodule update --remote libraries/transformers
 make
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11604>
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