[GHC] #11137: configure is broken for the unix package

[GHC]

#11137: configure is broken for the unix package
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        Reporter:  pgj               |                Owner:
            Type:  bug               |               Status:  upstream
        Priority:  normal            |            Milestone:
       Component:  libraries/unix    |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"ab79ed763cfbaa1b0d1f39ba5ed1cde7dffd4b87/ghc"
 ab79ed76/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ab79ed763cfbaa1b0d1f39ba5ed1cde7dffd4b87"
 Improve detection of `fdatasync(2)` (re #11137)

 This updates the `unix` submodule to pull in an improved
 Autoconf test for `fdatasync(2)` in cases where `<unistd.h>` lacks
 a declaration, but linking against `fdatasync` works which led to a
 false positive previously.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11137#comment:4>
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