[MacPorts] #52143: freecad @0.16.0 fails building on 10.6.8

[MacPorts]

#52143: freecad @0.16.0 fails building on 10.6.8
------------------------+--------------------------------
 Reporter:  braumann@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:              |       Port:  freecad
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 While upgrading `freecad @0.15.4671_1+gcc5` to `0.16_0` I run into this
 trouble:
 {{{
 ...
 :info:build cc1plus: error: unrecognized command line option "-Wno-unused-
 but-set-variable"
 :info:build [  1%] Generating
 ../../../Mod/PartDesign/WizardShaft/WizardShaft.py
 :info:build cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_cad_freecad/FreeCAD/work/FreeCAD-0.16/src/Mod/PartDesign
 && /opt/local/bin/cmake -E copy
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_cad_freecad/FreeCAD/work/FreeCAD-0.16/src/Mod/PartDesign/WizardShaft/WizardShaft.py
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_cad_freecad/FreeCAD/work/FreeCAD-0.16/Mod/PartDesign/WizardShaft/WizardShaft.py
 ...
 }}}
 There are more occurrences of this error later in the log. If intuitively
 have tested other compilers, like gcc5 and gcc6 as well as clang 3.7 (all
 from MacPorts), but these have failed with other weird errors, as far as I
 can remember.

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Ticket URL: <https://trac.macports.org/ticket/52143>
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