[MacPorts] #30388: mono fails to build on 10.7

[MacPorts]

#30388: mono fails to build on 10.7
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 Reporter:  rb@…               |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.0                                
 Keywords:  lion               |        Port:  mono                                 
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Comment(by craig-tanis@…):

 I got it to compile by adding "#define _XOPEN_SOURCE 600" at the top of
 mono/utils/mono-sigcontext.h

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Ticket URL: <https://trac.macports.org/ticket/30388#comment:8>
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