[MacPorts] #64817: llvm-3.4, clang-3.4: opportunistic use of ncurses

[MacPorts]

#64817: llvm-3.4, clang-3.4: opportunistic use of ncurses
--------------------+----------------------
 Reporter:  jmroot  |      Owner:  catap
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  llvm-3.4
--------------------+----------------------
 Since [d11c2377c9cff32cd5cb6a0ed11788cc46862c1a/macports-ports], the
 ncurses dependency is removed on <= 10.6, but there is nothing preventing
 the headers and library of the ncurses port from being used if it is
 installed. Thus the situation can arise that deactivating or uninstalling
 ncurses will break clang-3.4, without any warning since no dependency is
 declared.

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Ticket URL: <https://trac.macports.org/ticket/64817>
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