[MacPorts] #27343: qt4-mac @4.7.1 +universal Portfile referring to obsolete universal_sysroot

[MacPorts]

#27343: qt4-mac @4.7.1 +universal Portfile referring to obsolete universal_sysroot
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 Reporter:  corwin.amber@…          |       Owner:  macports-tickets@…                   
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.9.2                                
 Keywords:  deployment              |        Port:                                       
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 Since the use of {{{universal_sysroot}}} for compiling backward-compatible
 binaries has been dropped from the MacPorts trunk, the recommended method
 according to #19875 is to use {{{macosx_deployment_target}}}. The Qt-4
 Portfile ignores this variable and sets ${SDK} and
 ${MACOSX_DEPLOYMENT_TARGET} through use of ${os.version}, which causes the
 linker to fail.

 Attempted on 10.6.4 with macosx_deployment_target == 10.5.

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Ticket URL: <https://trac.macports.org/ticket/27343>
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