OSX 10.6 clang / llvm circular dependency

[Chris Jones]

> On 8 Feb 2019, at 8:55 pm, Michael Dickens <michaelld at macports.org> wrote:
> 
> OK some more sleuthing turns up that the issue was not the cxx11 PG, but rather this line in the cmake Portfile:
> {{{
> configure.cxx_stdlib libc++
> }}}
> before this line, the compiler is 'gcc-4.2', while after it is 'macports-clang-7.0' ... I'll keep poking, but I'm about done with the rabbit hole ... - MLD

If i am not mistaken that line has been there since aug 2017, and only active with 10.5 or older. 

https://github.com/macports/macports-ports/blob/master/devel/cmake/Portfile#L13

Does what you have differ from what is in master ?
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