[MacPorts] #44224: root5: fails to compile with libc++ on 10.7 (error: no matching function for call to 'isnan')

[MacPorts]

#44224: root5: fails to compile with libc++ on 10.7 (error: no matching function
for call to 'isnan')
---------------------+----------------------
 Reporter:  mojca@…  |      Owner:  jonesc@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:  lion     |       Port:  root5
---------------------+----------------------
 ROOT 5 fails to build with `libc++` on Lion:
   * https://sft.its.cern.ch/jira/browse/ROOT-6441

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Ticket URL: <https://trac.macports.org/ticket/44224>
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