[MacPorts] #69597: libcryptopp use broken on x86 due to using libstdc++

[MacPorts]

#69597: libcryptopp use broken on x86 due to using libstdc++
--------------------------+-------------------------
 Reporter:  barracuda156  |      Owner:  raphael-st
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.1
 Keywords:  mountainlion  |       Port:  libcryptopp
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 {{{
 INFO: Crypto++ was built without LLVM libc++. If you are using the library
 INFO: with modern Xcode, then you should add -stdlib=libc++ to CXXFLAGS.
 It is
 INFO: already present in the makefile, and you only need to uncomment it.
 . . .
 libcryptopp is using libstdc++ (this installation is configured to use
 libc++)
 --->  Found 1 broken port, determining rebuild order
 You can always run 'port rev-upgrade' again to fix errors.
 The following ports will be rebuilt: libcryptopp @8.9.0
 }}}

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Ticket URL: <https://trac.macports.org/ticket/69597>
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