[MacPorts] #69735: mkvtoolnix-legacy is broken on legacy systems

[MacPorts]

#69735: mkvtoolnix-legacy is broken on legacy systems
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  i0ntempest
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:  mountainlion, lion, snowleopard,
      Port:              |  leopard, tiger
  mkvtoolnix-legacy      |
-------------------------+-------------------------------------------------

Comment (by barracuda156):

 Replying to [comment:2 i0ntempest]:
 > Again I don't think 10.5 was ever supported because it never supported
 qt5. For 10.8-10.6, if the multiprecision library is the only problem then
 falling back one more version to v57 should work, since v58 introduced the
 requirement.
 >
 > Is your configure log from 10.8? If it has boost 1.76 it should have
 {{{boost/multiprecision/cpp_int.hpp}}}.

 I do not have 10.8 at hand, the log is from 10.6.

 I will look into `multiprecision`, I was not aware Boost lacks something
 on `ppc`. And I can try v57, if indeed Boost does not have that lib and it
 cannot be built on 32-bit.

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Ticket URL: <https://trac.macports.org/ticket/69735#comment:3>
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