[MacPorts] #35667: arm-elf-gcc fails to build when libunwind is installed

[MacPorts]

#35667: arm-elf-gcc fails to build when libunwind is installed
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 Reporter:  dirkx@…               |       Owner:  macports-tickets@…                   
     Type:  defect                |      Status:  new                                  
 Priority:  Normal                |   Milestone:  MacPorts Future                      
Component:  ports                 |     Version:  2.1.2                                
 Keywords:                        |        Port:  arm-elf-gcc                          
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 When libunwind is installed prior to a arm-elf-gcc (arm-elf-
 gcc-4.6.1_0.darwin_12.x86_64) build the following clash is reported:

 {{{
 opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_release_tarballs_ports_cross_arm-elf-gcc/arm-elf-
 gcc/work/gcc-4.6.1/libgcc/../gcc/unwind-dw2-fde.c:33:0:
 :info:build /opt/local/include/unwind.h:38:26: fatal error:
 Availability.h: No such file or directory
 }}}

 This pretty much akin to issue https://trac.macports.org/ticket/33364.

 de-activating & cleaning libunwind prior to build resolves this (2.1.2 on
 10.8)

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Ticket URL: <https://trac.macports.org/ticket/35667>
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