[MacPorts] #54593: Clang-select for clang-5.0 not working

[MacPorts]

#54593: Clang-select for clang-5.0 not working
----------------------+--------------------------
 Reporter:  hansgans  |      Owner:
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  clang-select
----------------------+--------------------------
 Setting the active port fails:
 sudo port select --set clang mp-clang-5.0
 Selecting 'mp-clang-5.0' for 'clang' failed: could not create new link
 "/opt/local/bin/c-index-test": target "/opt/local/bin/c-index-test-mp-
 devel" doesn't exist

 Installing clang-devel by hand solves the problem

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Ticket URL: <https://trac.macports.org/ticket/54593>
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