[GHC] #11761: autoconf 2.69 breaks configure

[GHC]

#11761: autoconf 2.69 breaks configure
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           Reporter:  kgardas        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.1
           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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 linux ppc64 buildbot reveals interesting issue which shows as following
 while running configure:
 {{{
 ./configure: line 561: save_bash_input: buffer already exists for new fd
 417
 }}}
 it looks like this issue is presented in configure only when configure is
 generated by autoconf 2.69. On the same platform hand installed autoconf
 2.68 produces working configure. I guess this is multi-platform so I do
 not mark platform here. Also as this is in 3th party package I'm reporting
 this just for the reference of known issue...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11761>
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