[GHC] #11168: Cross build broken in commit 7af29da05d

[GHC]

#11168: Cross build broken in commit 7af29da05d
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Build System      |              Version:  7.11
      Resolution:                    |             Keywords:  cross-compile
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hvr):

 Is there anything interesting logged to `config.log` telling us what
 Autoconf does exactly?

 Does it help if you comment out the `AC_USE_SYSTEM_EXTENSIONS` line in
 `libraries/base/configure.ac`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11168#comment:1>
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