[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):

 What compiler version does Xcode install for those macOS / OSX versions
 (`clang++ -v`)?

 On 10.9, I can add
 {{{
 PortGroup        compiler_blacklist_versions 1.0
 compiler.blacklist-append {clang < 700}
 }}}
 and that solves the issue (uses MacPorts clang 9). I'm guessing we'll need
 to bump this to maybe < 900 ... or something more? Hence my question at
 the top.

-- 
Ticket URL: <https://trac.macports.org/ticket/63553#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS