[MacPorts] #66712: ruby31 fails to build on 10.5 - cstdbool not found

[MacPorts]

#66712: ruby31 fails to build on 10.5 - cstdbool not found
----------------------------+--------------------
 Reporter:  rmottola        |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:
 Keywords:  leopard legacy  |       Port:  ruby31
----------------------------+--------------------
 By default, ports uses clang 7 and compilation dies with:
 {{{
 compiling init.c
 In file included from cxxanyargs.cpp:1:
 In file included from ../../.././include/ruby/ruby.h:25:
 In file included from ../../.././include/ruby/defines.h:74:
 In file included from ../../.././include/ruby/backward/2/bool.h:22:
 ../../.././include/ruby/internal/stdbool.h:31:12: fatal error: 'cstdbool'
 file not found
 #  include <cstdbool>
            ^~~~~~~~~~
 1 error generated.

 }}}

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Ticket URL: <https://trac.macports.org/ticket/66712>
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