OSX 10.6 clang / llvm circular dependency

[Michael Dickens]

Updated; rebuilt the PortIndex. No different. I find the following very
curious. "cmake" depends on itself circularly, which just can't be good;
and, the internal cmake dependency has somewhat different dependencies
compared with the outer one. It also has direct dependencies on clang-
7.0 and llvm-7.0, which doesn't seem correct to me based on the
Portfile. Hmmmm ...{{{
$ port rdeps cmake
The following ports are dependencies of cmake @3.13.4_0:
  clang-7.0
    xz
      libiconv
        gperf
      gettext
        ncurses
    cmake
      curl
        pkgconfig
        libidn2
          autoconf
          automake
          libtool
            xattr
              unzip
          libunistring
            perl5
              perl5.26
                db48
                gdbm
                  readline
            texinfo
              help2man
                perl5.28
                p5.28-locale-gettext
        libpsl
          python27
            bzip2
            expat
            libedit
            libffi
            openssl
              zlib
            sqlite3
            python_select
            python2_select
          glib2
            libxml2
              icu
            pcre
        curl-ca-bundle
      libarchive
        lzo2
        lz4
        zstd
      libuv
        legacy-support
      libcxx
        clang-6.0
          cctools
            libunwind-headers
            llvm-3.4
              llvm_select
          libomp
          llvm-6.0
            xar
          clang_select
          ld64
            ld64-127
              libmacho-headers
    llvm-7.0
}}}
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