[MacPorts] #60286: py27-pygtk needs newer nm

[MacPorts]

#60286: py27-pygtk needs newer nm
---------------------------+------------------------
 Reporter:  rmottola       |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:  leopard tiger  |       Port:  py27-pygtk
---------------------------+------------------------
 {{{
 if {${os.platform} eq "darwin" && ${os.major} < 10} {
     depends_build-append port:cctools
     configure.env-append NM=${prefix}/bin/nm
     configure.args-append lt_cv_path_NM=${prefix}/bin/nm
 }
 }}}

 to put inside the subport block fixes it

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Ticket URL: <https://trac.macports.org/ticket/60286>
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