[MacPorts] #64978: boost176 fails on 10.6.8 Rosetta with parameter syntax errors

[MacPorts]

#64978: boost176 fails on 10.6.8 Rosetta with parameter syntax errors
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  michaelld
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, snowleopard, rosetta
      Port:  boost176      |
---------------------------+-------------------------------------------

Comment (by barracuda156):

 Turned out this was the problem:

 {{{
 # makecontext/swapcontext introduced in 10.6
 if {${os.platform} eq "darwin" && ${os.major} < 10} {
     configure.args-append   --without-libraries=context \
                             --without-libraries=coroutine
 }
 }}}

 It does not work in Rosetta and must be disabled for `${os.major} == 10 &&
 ${build.arch} = ppc`.

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Ticket URL: <https://trac.macports.org/ticket/64978#comment:2>
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