[GHC] #10172: Cross-platform sed

[GHC]

#10172: Cross-platform sed
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        Reporter:  ezyang        |                Owner:
            Type:  task          |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Build System  |              Version:  7.11
      Resolution:                |             Keywords:
Operating System:  Solaris       |         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 thomie):

 kgardas: in Phab:D1467, we need to do some arithmetic. Does running `echo
 $((2*1000 + 16*10 + 0))` in the shell result in `2160` on all your
 systems? Or is it better to use `expr`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10172#comment:5>
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