[MacPorts] #54363: hs-bytestring-show: fails on 10.7

[MacPorts]

#54363: hs-bytestring-show: fails on 10.7
---------------------------------+-------------------
  Reporter:  mojca               |      Owner:  kencu
      Type:  defect              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:  lion
      Port:  hs-bytestring-show  |
---------------------------------+-------------------

Comment (by kencu):

 I see this, which looks like the error:
 {{{
 Setup: could not execute: /opt/local/bin/clang-mp-3.4
 }}}
 Which is a bit odd, as the compiler is set to `/usr/bin/clang` and
 `/usr/bin/clang++`. It comes to mind that haskell might possibly record
 the compiler used to build it somewhere, and then insist on finding that
 same compiler again. Maybe that is embedded in the ghc binary that is
 being installed? Is there a dependency on clang-3.4 needed here? Or
 possibly forcing a rebuild of ghc might find a new compiler.

 I know I had to reinstall clang-3.8 one time when I tried to run ghc. I
 previously had clang-3.8 set as my default compiler, would have used that
 to build ghc, and then I moved on to clang-3.9 and uninstalled clang-3.8.
 But ghc complained when it couldn't find clang-3.8.

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Ticket URL: <https://trac.macports.org/ticket/54363#comment:2>
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