[MacPorts] #64570: qt5 asks for clang 7.0 on 10.5.8

[MacPorts]

#64570: qt5 asks for clang 7.0 on 10.5.8
--------------------------+------------------------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.7.1
 Keywords:  powerpc       |       Port:  qt53, qt55, qt56, qt57, qt58
--------------------------+------------------------------------------
 As an example:


 {{{
 36-47:~ svacchanda$ sudo port -v install qt53
 --->  Computing dependencies for qt53..
 Error: Cannot install clang-7.0 for the arch 'powerpc' because
 Error: its dependency python27 does not build for the required arch by
 default
 Error: and the configured universal_archs 'ppc ppc64' are not sufficient.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there
 is a bug.
 Error: Processing of port qt53 failed
 }}}


 This is an obviously wrong behavior: qt5 has not been tested for PowerPC,
 but clang is known not to work.

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Ticket URL: <https://trac.macports.org/ticket/64570>
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