[MacPorts] #41321: cmake: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)

[MacPorts]

#41321: cmake: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or
later)
---------------------------+-----------------------
  Reporter:  ryandesign@…  |      Owner:  css@…
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.99
Resolution:                |   Keywords:  mavericks
      Port:  cmake         |
---------------------------+-----------------------

Comment (by nicos@…):

 Alright. Well, I unfortunately can't reproduce the error, which makes
 things slightly more complicated. Also, the error is slightly different:
 originally, both variables were empty, leading to errors in some cases. In
 the error you report, DEPLOYMENT_TARGET is set, but not SDK_ROOT, which
 always leads to an error to my understanding. The patch which was applied
 should have ensured that both are always set, which does not seem to
 happen in your case.

 First, attaching a full build log (main.log file) may be helpful to
 pinpoint the issue. I also noticed that the synergy Portfile makes some
 very specific changes to some cmake variables, so just to be sure, it
 could be interesting to check if other ports using the cmake portgroup are
 building or not. Some ports you could test to install could be eigen or
 eigen3, for example. They have the advantage of not having additional
 dependencies.

-- 
Ticket URL: <https://trac.macports.org/ticket/41321#comment:33>
MacPorts <http://www.macports.org/>
Ports system for OS X