[MacPorts] #55430: libunwind-headers @3.9.1 installs headers that cause other ports to fail to build

[MacPorts]

#55430: libunwind-headers @3.9.1 installs headers that cause other ports to fail to
build
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  Reporter:  ryandesign         |      Owner:  jeremyhu
      Type:  defect             |     Status:  reopened
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  libunwind-headers  |
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Comment (by ryandesign):

 Replying to [comment:6 ryandesign]:
 > Replying to [comment:3 jeremyhu]:
 > > My understanding is that gcc uses its own unwinder and NOT the one
 provided by the system.  Thus, it really does need to fix its header
 search paths to locate its own libunwind before looking in the system
 search paths.
 >
 > We're talking about the GCC that was included in Xcode on Snow Leopard
 and earlier. Doesn't it use the unwinder provided by the system?

 The problem is more boost-specific than I thought: the boost source code
 itself is doing a `#include <unwind.h>`, so we can't blame the old
 compiler for that.

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Ticket URL: <https://trac.macports.org/ticket/55430#comment:7>
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