[GHC] #11530: Make fails on systems with GREP_OPTIONS

[GHC]

#11530: Make fails on systems with GREP_OPTIONS
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        Reporter:  alexlegg      |                Owner:
            Type:  bug           |               Status:  patch
        Priority:  normal        |            Milestone:
       Component:  Build System  |              Version:  7.10.3
      Resolution:                |             Keywords:
Operating System:  POSIX         |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):  Phab:D1887
       Wiki Page:                |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"bfec4a6aade005b6dbd170645d4f2d062cee1d92/ghc" bfec4a6/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="bfec4a6aade005b6dbd170645d4f2d062cee1d92"
 Unset GREP_OPTIONS in build system

 Test Plan: GREP_OPTIONS=--blah ./validate

 Reviewers: austin, thomie

 Reviewed By: thomie

 Differential Revision: https://phabricator.haskell.org/D1887

 GHC Trac Issues: #11530
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11530#comment:3>
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