[MacPorts] #58876: ncurses-bootstrap fails to build as dependency on system with working libcxx environment

[MacPorts]

#58876: ncurses-bootstrap fails to build as dependency on system with working
libcxx environment
--------------------------------+--------------------
  Reporter:  grumpybozo         |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.5.4
Resolution:                     |   Keywords:
      Port:  ncurses-bootstrap  |
--------------------------------+--------------------

Comment (by grumpybozo):

 It's not doing the same for me:

 {{{
 # port deps ncurses-bootstrap compiler.fallback="macports-clang-8.0
 macports-clang-3.7 gcc-4.2 apple-gcc-4.2 macports-clang-3.4"
 cxx_stdlib=libc++
 Full Name: ncurses-bootstrap @6.1_0
 Build Dependencies:   clang-8.0
 }}}

 One thing that confuses me is that the configure step is setting prefix to
 /opt/local/libexec/libcxx-bootstrap, but that directory doesn't exist and
 never gets created. And the clang dependency port group looks in there for
 compilers that can't exist because the directory doesn't exist.

-- 
Ticket URL: <https://trac.macports.org/ticket/58876#comment:11>
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