[MacPorts] #58413: ragel 7.0.0.11 fails to build on macOS 10.14

[MacPorts]

#58413: ragel 7.0.0.11 fails to build on macOS 10.14
-----------------------+--------------------
 Reporter:  essandess  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.5.4
 Keywords:             |       Port:  ragel
-----------------------+--------------------
 Something to do with:

 {{{
 configure.cxx_stdlib libstdc++
 }}}


 {{{
 :info:build warning: include path for stdlibc++ headers not found; pass
 '-stdlib=
 libc++' on the command line to use the libc++ standard library instead
 [-Wstdlibc
 xx-not-found]
 :info:build In file included from idbase.cc:24:
 :info:build ./ragel.h:27:10: fatal error: 'iostream' file not found
 :info:build #include <iostream>
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58413>
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Ports system for macOS