[MacPorts] #63553: dvisvgm @2.12_0: fail to build on macOS 10.11.6

[MacPorts]

#63553: dvisvgm @2.12_0: fail to build on macOS 10.11.6
-----------------------+--------------------
  Reporter:  nortcele  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:
      Port:  dvisvgm   |
-----------------------+--------------------

Comment (by michaelld):

 OK thanks. My guess is that blocking `{clang < 900}` will work. I'll add
 that & we'll see how it goes.

-- 
Ticket URL: <https://trac.macports.org/ticket/63553#comment:7>
MacPorts <https://www.macports.org/>
Ports system for macOS