[GHC] #11729: `make sdist` target fails

[GHC]

#11729: `make sdist` target fails
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by erikd):

 * version:  8.0.1-rc2 => 7.10.3


Comment:

 Seems my make was missing the `lndir` executable which in Debian is part
 of the `xutils-dev` package.

 Would be nice of the build system failed more gracefully when it hits this
 issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11729#comment:3>
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